{"title":"FMF","description":"\u003ch2\u003eFMF | High-Performance Exhaust Systems \u0026amp; Parts for 2-Stroke \u0026amp; 4-Stroke\u003c\/h2\u003e\n\n\u003cp\u003e\nFMF Racing is one of the most respected names in dirt bike and motocross exhaust performance, trusted by professional racers and weekend riders alike. Known for race-proven engineering, FMF exhaust systems are designed to improve power delivery, throttle response, and overall ride character across motocross, off-road, and trail applications. Whether you ride a 2-stroke or 4-stroke, FMF offers tuned solutions that balance performance gains with durability and sound control.\n\u003c\/p\u003e\n\n\u003cp\u003e\nAt BTO Sports, you can \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-shop-all\"\u003eshop all FMF products\u003c\/a\u003e, browse dedicated \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-shop-all-exhausts\"\u003eFMF exhaust systems\u003c\/a\u003e, or find discounted options in the \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-exhaust-sale\"\u003eFMF exhaust sale\u003c\/a\u003e. FMF exhausts are engineered to match specific riding styles, terrain types, and engine platforms so riders can dial in performance without guesswork.\n\u003c\/p\u003e\n\n\u003ch3\u003eFMF Exhaust Categories | Built for How You Ride\u003c\/h3\u003e\n\n\u003cp\u003e\nFMF offers a full lineup of performance exhaust components designed around engine type and riding demands. Popular performance categories include high-flow \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-2-stroke-pipes\"\u003e2-stroke pipes\u003c\/a\u003e that enhance powerband response, durable \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-2-stroke-silencers\"\u003e2-stroke silencers\u003c\/a\u003e for tuned sound and throttle feel, and race-inspired \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-4-stroke-exhausts\"\u003e4-stroke exhausts\u003c\/a\u003e that improve torque, horsepower, and weight savings.\n\u003c\/p\u003e\n\n\u003cp\u003e\nFor riders chasing top-tier race performance, the \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-factory-4-1-exhausts\"\u003eFMF Factory 4.1 exhausts\u003c\/a\u003e represent FMF’s flagship systems, combining advanced materials, precision tuning, and competition-level performance for motocross and off-road racing.\n\u003c\/p\u003e\n\n\u003ch3\u003eAccessories, ATV Systems \u0026amp; Lifestyle Gear\u003c\/h3\u003e\n\n\u003cp\u003e\nIn addition to full exhaust systems, FMF offers a wide range of supporting components and gear. Riders can find replacement parts and tuning components in \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-exhaust-accessories\"\u003eFMF exhaust accessories\u003c\/a\u003e, performance-focused \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-atv-exhaust\"\u003eATV exhaust systems\u003c\/a\u003e for quad riders, and off-bike style options in \u003ca href=\"https:\/\/www.btosports.com\/collections\/fmf-casual-wear\"\u003eFMF casual wear\u003c\/a\u003e.\n\u003c\/p\u003e\n\n\u003ch3\u003eOEM-Specific FMF Exhaust Options\u003c\/h3\u003e\n\n\u003cp\u003e\nFMF designs exhaust systems specifically for popular OEM platforms to ensure proper fitment and optimized performance. Riders can shop bike-specific options such as \u003ca href=\"https:\/\/www.btosports.com\/collections\/gasgas-fmf-pipes\"\u003eGasGas FMF pipes\u003c\/a\u003e, \u003ca href=\"https:\/\/www.btosports.com\/collections\/gasgas-fmf-2t-silencer\"\u003eGasGas 2-stroke silencers\u003c\/a\u003e, \u003ca href=\"https:\/\/www.btosports.com\/collections\/husqvarna-fmf-pipes\"\u003eHusqvarna FMF pipes\u003c\/a\u003e, and \u003ca href=\"https:\/\/www.btosports.com\/collections\/ktm-powerparts-fmf-2t-silencer\"\u003eKTM PowerParts FMF 2-stroke silencers\u003c\/a\u003e. These OEM-matched systems help riders unlock performance without compromising reliability or fit.\n\u003c\/p\u003e\n\n\u003cp\u003e\nFrom motocross tracks to off-road trails, FMF exhaust systems deliver proven performance gains backed by decades of racing experience. Explore the categories above to find the right FMF setup for your dirt bike, riding style, and performance goals.\n\u003c\/p\u003e\n","products":[{"product_id":"fmf-factory-fatty-pipe-kawasaki","title":"FMF - Factory Fatty Pipe (Kawasaki)","description":"\u003ch3\u003eFMF - Factory Fatty Pipe (Kawasaki)\u003c\/h3\u003e\n\u003ch4\u003eFeatures:\u003c\/h4\u003e\n\u003cul class=\"mb-4 mt-2 pl-3 font-weight-light\" style=\"color: #231f20; font-family: 'IBM Plex Sans Condensed', sans-serif; font-size: 15px; background-color: #ffffff; margin-top: .65625rem; margin-bottom: 1.96875rem; padding-left: 1.3125rem;\"\u003e\n\u003cli class=\"ng-star-inserted\"\u003eThe Factory Fatty is reminiscent of the “works” or cone pipe once used by Factory Teams and it shares many of the same characteristics with its craftsmanship and material quality\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eBroadens and smooths out the power curve while boosting gains throughout the entire power band, more low-end, more mid, and increased over-rev\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eNo matter what type of riding you do, the Fatty has the benefits you’re looking for\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eLighter 20 gauge steel used for the body of the pipe\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e19 Gauge steel used for the header portion\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eHand pounded seams for smooth flow transitions\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FMF","offers":[{"title":"KX 85 - '14-'25","offer_id":50147958718751,"sku":"79-1222F","price":269.99,"currency_code":"USD","in_stock":true},{"title":"KX 100 - '14-'21","offer_id":49249991491871,"sku":"79-1222F","price":269.99,"currency_code":"USD","in_stock":true},{"title":"KX 112 - '22-'25","offer_id":50147958751519,"sku":"79-1222F","price":269.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/fmf-factory-fatty-pipe_c7e2a25c-da30-4e22-8845-49261eba6b07.jpg?v=1746123062"},{"product_id":"fmf-fatty-pipe-honda","title":"FMF - Fatty Pipe (Honda)","description":"\u003ch3\u003eFMF - Fatty Pipe (Honda)\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial, Helvetica;\"\u003eThe patented FMF Fatty Pipe is hands down the most copied performance exhaust pipe in the world. As with all of our pipes, the Fatty is computer designed and dyno tested giving each bike model individual power gains. Our Tru-Flo stamping process ensures quality fitment, thus optimal performance. Fabricated from sturdy 19 gauge US steel, the Fatty is known for its all-encompassing power gains from bottom to top. Nickel plating provides a durable easy cleaning finish. The FMF Fatty Pipe is our number one seller due to the excellent versatility it provides to racers and riders of all levels.\u003c\/span\u003e\u003c\/p\u003e","brand":"FMF","offers":[{"title":"CR 80R - '96-02","offer_id":49249998045471,"sku":"FMF021000","price":269.99,"currency_code":"USD","in_stock":false},{"title":"CR 85R - 05-'07","offer_id":50090469064991,"sku":"18200160","price":269.99,"currency_code":"USD","in_stock":false},{"title":"CR 125R - '90-'97","offer_id":50090503471391,"sku":"78-1123","price":278.99,"currency_code":"USD","in_stock":true},{"title":"CR 125R 98-'99","offer_id":50090548166943,"sku":"78-1170","price":278.99,"currency_code":"USD","in_stock":true},{"title":"CR 125R - '00-'01","offer_id":50090585981215,"sku":"FMF020375","price":269.99,"currency_code":"USD","in_stock":true},{"title":"CR 125R - '02-'03","offer_id":50090622419231,"sku":"78-1151","price":269.99,"currency_code":"USD","in_stock":true},{"title":"CR 125R - '04","offer_id":50090639261983,"sku":"18200002","price":269.99,"currency_code":"USD","in_stock":true},{"title":"CR 125R - '05-'07","offer_id":50090662035743,"sku":"78-1128","price":269.99,"currency_code":"USD","in_stock":true},{"title":"CR 250R - '97-'99","offer_id":50090683564319,"sku":"FMFH62","price":292.49,"currency_code":"USD","in_stock":true},{"title":"CR 250R - '00-'01","offer_id":50090722754847,"sku":"FMF020378","price":269.99,"currency_code":"USD","in_stock":true},{"title":"CR 250R - '02","offer_id":50090756800799,"sku":"78-1177","price":292.49,"currency_code":"USD","in_stock":true},{"title":"CR 250R - '03-'04","offer_id":50090793304351,"sku":"78-1024","price":269.99,"currency_code":"USD","in_stock":false},{"title":"CR 250R - '05-'07","offer_id":50090825253151,"sku":"18200214","price":269.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO__3__0000_FMF021000.jpg?v=1746123060"},{"product_id":"fmf-fatty-pipe-suzuki","title":"FMF - Fatty Pipe (Suzuki)","description":"\u003ch3\u003e\u003cb\u003eFMF - Fatty Pipe\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial, Helvetica;\"\u003eThe patented FMF Fatty Pipe is hands down the most copied performance exhaust pipe in the world. As with all of our pipes, the Fatty is computer designed and dyno tested giving each bike model individual power gains. Our Tru-Flo stamping process ensures quality fitment, thus optimal performance. Fabricated from sturdy 19 gauge US steel, the Fatty is known for its all-encompassing power gains from bottom to top. Nickel plating provides a durable easy cleaning finish. The FMF Fatty Pipe is our number one seller due to the excellent versatility it provides to racers and riders of all levels.\u003c\/span\u003e\u003c\/p\u003e","brand":"FMF","offers":[{"title":"RM 85 - '02-'25","offer_id":49250010595615,"sku":"78-1427","price":269.99,"currency_code":"USD","in_stock":true},{"title":"RM 100 - '03-'04","offer_id":50094678147359,"sku":"78-1273","price":269.99,"currency_code":"USD","in_stock":true},{"title":"RM 125 - '97-'00","offer_id":50094704787743,"sku":"78-1470","price":278.99,"currency_code":"USD","in_stock":true},{"title":"RM 125 - '01-'07","offer_id":50094733558047,"sku":"78-1401","price":269.99,"currency_code":"USD","in_stock":true},{"title":"RM 250 - '96-'98","offer_id":50094755971359,"sku":"78-1465","price":278.99,"currency_code":"USD","in_stock":true},{"title":"RM 250 - '99-'00","offer_id":50094779269407,"sku":"78-1472","price":278.99,"currency_code":"USD","in_stock":true},{"title":"RM 250 - '01","offer_id":50094829895967,"sku":"FMF020390","price":269.99,"currency_code":"USD","in_stock":true},{"title":"RM 250 - '02","offer_id":50094881669407,"sku":"78-1455","price":269.99,"currency_code":"USD","in_stock":false},{"title":"RM 250 - '04-'08","offer_id":50094902542623,"sku":"78-1487","price":269.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/fmf-fatty-pipe-1_853d8ef1-b97e-4c6d-a5b3-353570d60eda.jpg?v=1746123058"},{"product_id":"fmf-gnarly-pipe-honda","title":"FMF - Gnarly Pipe (Honda)","description":"\u003ch2\u003e\u003cb\u003eFMF - Gnarly Pipe\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px;\"\u003eGnarly Power and burly construction makes the FMF Gnarly the strongest, best performing pipe off-road pipe on the market. But the real meat behind the muscle is the material. Beefy 18 gauge US steel makes this the toughest material in our pipe selection. Strong and rugged, this aggressive pipe dishes out handfuls of torque and bottom to mid range pull needed for late model 200cc through 500cc machines and the rigors of the off road domain. The FMF Gnarly is everything the name implies with performance gains well focused towards bottom and mid power with the goal being increased tractability. This makes the Gnarly an excellent off-road pipe and superb for tighter mx tracks.\u003c\/p\u003e","brand":"FMF","offers":[{"title":"CR 250R - '92-'96","offer_id":49250020917535,"sku":"FMFHG31","price":292.49,"currency_code":"USD","in_stock":true},{"title":"CR 250R - '00-'01","offer_id":50096588456223,"sku":"78-1186","price":269.99,"currency_code":"USD","in_stock":true},{"title":"CR 250R - '02","offer_id":50096621027615,"sku":"78-1178","price":292.49,"currency_code":"USD","in_stock":true},{"title":"CR 250R - '03-'04","offer_id":50096647340319,"sku":"18200007","price":269.99,"currency_code":"USD","in_stock":true},{"title":"CR 250R - '05-'07","offer_id":50096683811103,"sku":"18200215","price":269.99,"currency_code":"USD","in_stock":false},{"title":"CR 500R - 85-'88","offer_id":50096723624223,"sku":"78-1110","price":341.99,"currency_code":"USD","in_stock":true},{"title":"CR 500R - '89-'01","offer_id":50096779526431,"sku":"78-1125","price":341.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO__0000_FMF-HG31.jpg?v=1746123056"},{"product_id":"fmf-gnarly-pipe-kawasaki","title":"FMF - Gnarly Pipe (Kawasaki)","description":"\u003ch3\u003eFMF - Gnarly Pipe (Kawasaki)\u003c\/h3\u003e\n\u003cp style=\"font-size: 14px;\"\u003eGnarly Power and burly construction makes the FMF Gnarly the strongest, best performing pipe off-road pipe on the market. But the real meat behind the muscle is the material. Beefy 18 gauge US steel makes this the toughest material in our pipe selection. Strong and rugged, this aggressive pipe dishes out handfuls of torque and bottom to mid range pull needed for late model 200cc through 500cc machines and the rigors of the off road domain. The FMF Gnarly is everything the name implies with performance gains well focused towards bottom and mid power with the goal being increased tractability. This makes the Gnarly an excellent off-road pipe and superb for tighter mx tracks.\u003c\/p\u003e","brand":"FMF","offers":[{"title":"KDX 200 - '95-'06 (Desert Pipe)","offer_id":49250024358175,"sku":"78-1230","price":269.99,"currency_code":"USD","in_stock":true},{"title":"KDX 200 - '95-'06 (Woods Pipe)","offer_id":50146010857759,"sku":"78-1265","price":269.99,"currency_code":"USD","in_stock":true},{"title":"KDX 220R - '95-'06 (Desert Pipe)","offer_id":50145980907807,"sku":"78-1230","price":269.99,"currency_code":"USD","in_stock":true},{"title":"KDX 220R - '95-'06 (Woods Pipe)","offer_id":50146010890527,"sku":"78-1265","price":269.99,"currency_code":"USD","in_stock":true},{"title":"KX 250 - '97-'00","offer_id":50146039726367,"sku":"78-1231","price":278.99,"currency_code":"USD","in_stock":true},{"title":"KX 250 - '01-'02","offer_id":50146057158943,"sku":"78-1287","price":269.99,"currency_code":"USD","in_stock":true},{"title":"KX 500 - '88-'04 (Desert Pipe)","offer_id":50146076328223,"sku":"78-1215","price":341.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO__0000_FMF-KG30.jpg?v=1746123055"},{"product_id":"fmf-gnarly-pipe-ktm","title":"FMF - Gnarly Pipe (KTM)","description":"\u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eFMF – Gnarly Pipe (KTM)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/g4yniB4mWv4?si=nLwYoc5lnZgxfdxe\"\u003e\n\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003eFMF Gnarly Pipe\u003c\/strong\u003e\u003cspan\u003e is made for riders who push deep into rough terrain and want their bike to hit harder down low. This is FMF’s go-to off-road pipe — strong, powerful, and ready for everything from tight woods to open desert. It’s built from heavy-duty 18-gauge U.S. steel, making it the toughest pipe in FMF’s lineup, and it’s tuned to boost torque and tractability right where you need it most.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eDesigned for KTM two-strokes from 200cc to 500cc, the Gnarly gives your bike a deeper, stronger feel when you roll on the throttle. It’s built to handle serious punishment — rocks, crashes, and endless off-road miles — while still delivering crisp, reliable performance. The low-to-mid power gains make it perfect for riders who like to lug through tough sections or dig in on technical climbs. O-rings are included for a tight, leak-free fit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e It gives your KTM that brute strength down low — real torque that helps you crawl over obstacles or rip through slick, rooty trails without stalling. It’s the kind of pipe you can smash into a log and keep riding like nothing happened.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e The Gnarly makes your bike easier to control when the trail gets rough. You’ll get stronger low-end pull, better traction, and smoother power through the midrange, so it’s easier to stay balanced and keep momentum. The thick steel build shrugs off impacts, and the nickel plating keeps it looking sharp even after countless rides.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eVariants \/ Options:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e Fits most KTM two-stroke models (200cc–500cc range). Direct bolt-on fit for off-road and enduro setups.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFocused on low-end torque and midrange power\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eHeavy-duty 18-gauge U.S. steel for extreme durability\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eNickel-plated finish resists rust and wear\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTuned for 200cc–500cc KTM two-stroke engines\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eBuilt to handle rocks, logs, and off-road abuse\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eIncludes O-rings for a secure, tight fit\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: 14px;\"\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"200 EXC - 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Factory Fatty Pipe (Yamaha)","description":"\u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eFMF - Factory Fatty Pipe (Yamaha)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/g4yniB4mWv4?si=nLwYoc5lnZgxfdxe\"\u003e\n\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFMF built the \u003c\/span\u003e\u003cspan\u003eFactory Fatty Pipe\u003c\/span\u003e\u003cspan\u003e for riders who want that old-school factory feel — raw power, clean response, and a sound that hits deep. Inspired by the original “works” cone pipes from pro race teams, this one brings that same hand-built race-shop quality straight to your Yamaha two-stroke. It looks, feels, and runs like something straight off a factory bike.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eMade from lightweight 20-gauge steel with a 19-gauge header section, every Factory Fatty is hand-pounded and perfectly shaped to smooth exhaust flow and boost performance across the board. You’ll feel stronger pull right off the bottom, cleaner midrange, and more over-rev when you stay in it. No matter if you’re moto racing, trail riding, or just chasing buddies around the track — this pipe delivers that crisp, aggressive FMF powerband everyone’s after.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e It’s that perfect blend of sound and snap. The Factory Fatty gives your Yamaha that classic two-stroke bark, but with more usable power everywhere. It makes the bike feel alive — like the motor’s breathing better and begging to be ridden harder.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e If you’re new to upgrading pipes, this one’s an easy win. You’ll feel a smoother hit when you roll on the throttle, better pull through the mid, and a cleaner rev up top. Plus, it’s built tough enough to handle crashes and deep ruts without folding. It’s one of those upgrades that instantly makes your bike more fun to ride.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eVariants \/ Options:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e Available for a wide range of Yamaha two-stroke models. Direct bolt-on fitment with FMF quality and finish.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eInspired by FMF “works” cone pipes used by factory teams\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eBroadens and smooths the power curve across the rev range\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eMore low-end torque, stronger mid, and better over-rev\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e20-gauge steel body, 19-gauge steel header\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eHand-pounded seams for smoother exhaust flow\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eLightweight, race-proven FMF construction\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"YZ 65 - '18-'25","offer_id":49250411839775,"sku":"78-1315F","price":269.99,"currency_code":"USD","in_stock":true},{"title":"YZ 85 - '02-'18","offer_id":50148718903583,"sku":"fmf024039","price":269.99,"currency_code":"USD","in_stock":false},{"title":"YZ 85 - '19-'25","offer_id":50148740759839,"sku":"78-1313F","price":269.99,"currency_code":"USD","in_stock":true},{"title":"YZ 85LW - '22-'25","offer_id":50148740792607,"sku":"78-1313F","price":269.99,"currency_code":"USD","in_stock":true},{"title":"YZ 125 - '05-'21","offer_id":50148769825055,"sku":"78-1382F","price":269.99,"currency_code":"USD","in_stock":true},{"title":"YZ 125 - '22-'25","offer_id":50148795285791,"sku":"78-024077","price":269.99,"currency_code":"USD","in_stock":true},{"title":"YZ 125X - '20-'22","offer_id":50148769857823,"sku":"78-1382F","price":269.99,"currency_code":"USD","in_stock":true},{"title":"YZ 125X - '23-'25","offer_id":50148795318559,"sku":"78-024077","price":269.99,"currency_code":"USD","in_stock":true},{"title":"YZ 250 - '99-'25","offer_id":50148826415391,"sku":"78-1359F","price":260.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/FMF---Factory-Fatty-Pipe-_28KTM_29_57029759-ae67-43f9-92a4-c5c2dfdadded.png?v=1746123030"},{"product_id":"fmf-premier-muffler-packing","title":"FMF - Premier Muffler Packing","description":"\u003ch2\u003e\u003cstrong\u003eFMF - Premier Muffler Packing\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cp data-end=\"36\" data-start=\"0\"\u003eFresh power is just a repack away.\u003c\/p\u003e\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"339\" data-start=\"38\"\u003eFMF’s Premier Muffler Packing isn’t just filler—it’s a power-restoring performance upgrade. Made from a fine blend of interwoven fiberglass fibers, this high-temp packing is engineered to reduce sound, boost performance, and last longer under pressure. And yeah, that signature red? It means business.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cspan style=\"font-weight: bold;\"\u003eKey Features: \u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eFeatures high temperature-resistant fiberglass\u003c\/li\u003e\n\u003cli\u003eIdeal for MX applications where maximum sound absorption is not a necessity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"FMF","offers":[{"title":"Premier 2-Stroke Packing","offer_id":49250492547359,"sku":"18600827","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/Untitleddesign_cf59c369-d960-425a-8d0a-14e35001a54d.png?v=1754494555"},{"product_id":"fmf-powercore-4-exhaust-atv","title":"FMF - Powercore 4 Exhaust (ATV)","description":"\u003ch2\u003e\u003cspan size=\"4\" style=\"font-size: large;\"\u003e\u003cstrong\u003eFMF - Powercore 4 Exhaust (ATV)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\r\n\u003cul style=\"font-size: 14px;\"\u003e\r\n\u003cli style=\"font-size: 14px;\"\u003eThe PowerCore 4 is the original race design muffler.  Aluminum construction and stainless steel Hi-Flo endcaps make for the perfect balance of performance and strength.  If you’re looking to give your ATV a boost, the PowerCore 4 has the perfect power to price ratio.\u003c\/li\u003e\r\n\u003cli style=\"font-size: 14px;\"\u003eCompletely redesigned for all late model applications\u003c\/li\u003e\r\n\u003cli style=\"font-size: 14px;\"\u003eAluminum performance muffler with durable stainless steel components\u003c\/li\u003e\r\n\u003cli style=\"font-size: 14px;\"\u003e99dB sound level with optional quiet insert (-3dB)\u003c\/li\u003e\r\n\u003cli style=\"font-size: 14px;\"\u003eUse with stock or FMF header\u003c\/li\u003e\r\n\u003cli style=\"font-size: 14px;\"\u003eRemovable spark arrestor included\u003c\/li\u003e\r\n\u003cli style=\"font-size: 14px;\"\u003eEasily serviced for repacking\u003c\/li\u003e\r\n\u003c\/ul\u003e","brand":"FMF","offers":[{"title":"2008 \/ YAMAHA - 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Whether you’re racing dunes, hitting trails, or ripping around the track, this pipe gives your two-stroke ATV that crisp, responsive feel FMF is known for.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eIt’s a true performance upgrade you can feel right away — more snap off the bottom, better pull through the gears, and that unmistakable FMF sound. Plus, the chrome finish keeps it looking sharp no matter how hard you ride.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eThis pipe helps your ATV make power more efficiently, so it accelerates faster and runs smoother without bogging. The better exhaust flow means you get stronger response every time you hit the throttle, and the durable steel construction holds up through mud, rocks, and rough rides. Bolt it on and you’ll instantly notice the difference.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eVariants \/ Options:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eAvailable for a variety of two-stroke ATV models. \u003c\/span\u003e\u003cspan\u003eNote: Yamaha Banshee requires two pipes — pricing reflects this requirement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eComputer-designed and dyno-tested for each ATV model\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTru-Flo stamping ensures precise fit and flow\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003e19-gauge U.S. steel construction for strength and durability\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eChrome-plated finish resists corrosion and adds a factory look\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eImproves power across the entire rpm range\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eMade in the USA\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"Honda - 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Banshee \/ 2006","offer_id":49250603827487,"sku":"FMFY44","price":512.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/FMFFATTYATV_174e563d-75bb-41a4-804d-de3c7cc323bf.jpg?v=1746123023"},{"product_id":"fmf-atv-2-stroke-powercore-2-silencer","title":"FMF - ATV 2-Stroke Powercore 2 Silencer","description":"\u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eFMF – ATV 2-Stroke Powercore 2 Silencer\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/g4yniB4mWv4?si=nLwYoc5lnZgxfdxe\"\u003e\n\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003eFMF Powercore 2 Silencer\u003c\/strong\u003e\u003cspan\u003e is the standard by which all two-stroke silencers are judged — and for ATVs, it’s an instant performance upgrade. Designed and dyno-tested for each specific ATV model, the Powercore 2 delivers stronger acceleration, smoother throttle response, and that crisp FMF tone every rider loves. Whether you’re blasting dunes, racing MX, or crawling trails, this silencer gives your machine a broader powerband and a cleaner pull from bottom to top.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe Powercore 2 features a lightweight \u003c\/span\u003e\u003cspan\u003eextruded 6060 T6 aluminum canister\u003c\/span\u003e\u003cspan\u003e mated to a \u003c\/span\u003e\u003cspan\u003eperforated core\u003c\/span\u003e\u003cspan\u003e that improves flow and maintains consistent back pressure. The \u003c\/span\u003e\u003cspan\u003ePerformance Flow end cap\u003c\/span\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cspan\u003enickel-plated front stinger\u003c\/span\u003e\u003cspan\u003e are made from stainless steel for unbeatable strength and long-lasting shine. It’s completely \u003c\/span\u003e\u003cspan\u003erepackable\u003c\/span\u003e\u003cspan\u003e and bolts right up to both stock and aftermarket pipes. Fabricated using FMF’s \u003c\/span\u003e\u003cspan\u003eTru-Flo stamping process\u003c\/span\u003e\u003cspan\u003e, the fit is always perfect, ensuring optimal performance and no fuss during installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e It wakes up the motor and makes the throttle feel more alive. The Powercore 2 gives your ATV smoother power delivery, a deep FMF tone, and race-proven durability — all without adding weight or noise.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e This silencer helps your two-stroke ATV make better, cleaner power across the rpm range. It’s durable, easy to maintain, and designed to last — perfect for riders who want more response and less maintenance. The chrome-plated and stainless construction keeps it looking sharp, and the repackable core means it stays performing like new season after season.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eVariants \/ Options:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e Available for a wide range of two-stroke ATVs. \u003c\/span\u003e\u003cspan\u003eNote: Yamaha Banshee models require two silencers — pricing reflects this.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eComputer-designed and dyno-tested for each ATV model\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003e6060 T6 aluminum oval canister with perforated core\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eStainless steel Performance Flow end cap and front stinger\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTru-Flo stamping process ensures perfect fit and performance\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eCompletely repackable for long-term 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Works with most modern Kawasaki off-road and dual-sport models.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eNoticeable increase in \u003c\/span\u003e\u003cspan\u003epower and torque\u003c\/span\u003e\u003cspan\u003e across the rpm range\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eHi-Flo core design\u003c\/span\u003e\u003cspan\u003e for improved airflow and throttle response\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eDurable stainless steel and aluminum\u003c\/span\u003e\u003cspan\u003e construction\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eSpace Age internal packing\u003c\/span\u003e\u003cspan\u003e extends service life\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eEnhanced sonic evacuation\u003c\/span\u003e\u003cspan\u003e for better exhaust flow\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRemovable spark arrestor\u003c\/span\u003e\u003cspan\u003e included\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eCompatible with \u003c\/span\u003e\u003cspan\u003eFMF or stock headers\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFactory-level performance at an affordable price\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"KX 450F - '24-'25","offer_id":50047678382367,"sku":"79-042401","price":359.99,"currency_code":"USD","in_stock":false},{"title":"KX 450F - '19-'23","offer_id":50047674188063,"sku":"18211886","price":359.99,"currency_code":"USD","in_stock":true},{"title":"KX 450F - '16-'18","offer_id":50047670812959,"sku":"79-3048","price":359.99,"currency_code":"USD","in_stock":false},{"title":"KX 450F -'12-'15","offer_id":52245106098463,"sku":"18211522","price":359.99,"currency_code":"USD","in_stock":true},{"title":"KX 250F - '25","offer_id":51098699923743,"sku":"79-042409","price":359.99,"currency_code":"USD","in_stock":false},{"title":"KX 250F - '21-'24","offer_id":50047669272863,"sku":"79-042392","price":359.99,"currency_code":"USD","in_stock":true},{"title":"KX 250F - '17-'20","offer_id":50047665504543,"sku":"18211794","price":359.99,"currency_code":"USD","in_stock":true},{"title":"KX 250F - '09-'16","offer_id":50047663571231,"sku":"18211520","price":359.99,"currency_code":"USD","in_stock":true},{"title":"KLX 300R - '20-'21","offer_id":49253158813983,"sku":"79-42387","price":359.99,"currency_code":"USD","in_stock":true},{"title":"KX 250X - '25","offer_id":51098699956511,"sku":"79-042409","price":359.99,"currency_code":"USD","in_stock":false},{"title":"KX 250X - '21-'24","offer_id":50047669305631,"sku":"79-042392","price":359.99,"currency_code":"USD","in_stock":true},{"title":"KX 450X - '24-'25","offer_id":50047678415135,"sku":"79-042401","price":359.99,"currency_code":"USD","in_stock":false},{"title":"KX 450X - '19-'23","offer_id":50047674220831,"sku":"18211886","price":359.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO_-Recovered.psd_0000_18212091.jpg?v=1726041593"},{"product_id":"fmf-gnarly-pipe-husqvarna","title":"FMF - Gnarly Pipe (Husqvarna)","description":"\u003ch3\u003eFMF - Gnarly Pipe (Husqvarna)\u003c\/h3\u003e\n\u003cp\u003eThe FMF Gnarly Pipe…the name says it all. 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In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our Factory Forward Engineering - moving the muffler closer to the motor to centralize mass. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet our exacting specifications and is manufactured 100% at our Southern California factory.\u003c\/p\u003e\n\u003ch4\u003eFeatures:\u003c\/h4\u003e\n\u003c\/div\u003e\n\u003cul class=\"mb-4 mt-2 pl-3 font-weight-light\" style=\"color: #231f20; font-family: 'IBM Plex Sans Condensed', sans-serif; font-size: 15px; background-color: #ffffff; margin-bottom: 1.96875rem; margin-top: .65625rem; padding-left: 1.3125rem;\"\u003e\n\u003cli class=\"ng-star-inserted\"\u003eThe Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externally\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eShorter overall length that is less susceptible to crash damage and complementary to FMF's Factory Forward Engineering - moving the muffler closer to the motor to centralize mass\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eThe Factory 4.1 RCT is constructed from only aerospace grade materials that meet FMF's exacting specifications and is manufactured 100% at their Southern California factory\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eMassive Power gains throughout the RPM range.\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eHuge weight savings\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eNew RTS (Rapid Tuning System)\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eIncludes MegaBomb header\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eIncludes spark arrestor screen insert\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003eCarbon Fiber end cap\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FMF","offers":[{"title":"FC 250 - 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Built with FMF’s exclusive Resonance Chamber Technology™ (RCT) both inside and out, this system smooths exhaust flow, sharpens throttle response, and delivers a broader power curve across the entire rpm range. It’s designed to make your GasGas lighter, faster, and more responsive while maintaining that deep, clean FMF tone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eConstructed entirely from aerospace-grade titanium, the Factory 4.1 RCT features a Blue Anodized Titanium canister, carbon fiber end cap, and Titanium mid pipe for unbeatable strength and weight reduction. FMF’s Factory Forward Engineering moves the muffler closer to the motor for better balance and handling, while the shorter overall length makes it more resistant to crash damage. With the Rapid Tuning System (RTS) and included 94dB insert and spark arrestor, this slip-on gives you full control over your sound and setup.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e It’s lightweight, responsive, and race-proven — everything a GasGas exhaust should be. The titanium build not only looks incredible but also frees up power while keeping noise levels dialed. You can feel the throttle snap and midrange pull instantly.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e This slip-on adds serious performance without the hassle of a full system. You’ll notice stronger power delivery across the rpm range, better throttle feel, and improved handling from the centralized weight. Plus, with the included inserts, it’s easy to switch between race-day performance and trail-ready compliance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eVariants \/ Options:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e Available in Blue Anodized Titanium with Carbon Fiber End Cap. Compatible with FMF or OEM headers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFMF Resonance Chamber Technology™ (RCT) for enhanced torque and sound control\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFactory Forward Engineering centralizes mass for better balance\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTitanium construction throughout: canister and mid pipe\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eBlue anodized finish with carbon fiber end cap for factory style\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRapid Tuning System (RTS) for easy insert and maintenance changes\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eMassive power gains throughout the rpm range\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eHuge weight savings – just 6.4 lbs. total\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eIncludes spark arrestor screen and 94dB quiet insert\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eClosed-course use only\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eHandcrafted in Southern California, USA\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"EC 250F - '21 \/ Not Included","offer_id":50037012037919,"sku":"79-40417","price":584.99,"currency_code":"USD","in_stock":true},{"title":"EC 350F - '21 \/ Not Included","offer_id":50037012070687,"sku":"79-40417","price":584.99,"currency_code":"USD","in_stock":true},{"title":"EX 250F - '21-'23 \/ Included","offer_id":49254834077983,"sku":"79-40416","price":769.49,"currency_code":"USD","in_stock":true},{"title":"EX 350F - '21-'23 \/ Included","offer_id":50036750942495,"sku":"79-40412","price":769.49,"currency_code":"USD","in_stock":true},{"title":"EX 450F - '21-'23 \/ Included","offer_id":50036750975263,"sku":"79-40412","price":769.49,"currency_code":"USD","in_stock":true},{"title":"MC 250F 2'21-'23 \/ Included","offer_id":49254834307359,"sku":"79-40416","price":769.49,"currency_code":"USD","in_stock":true},{"title":"MC 350F - '21-'23 \/ Included","offer_id":50036751008031,"sku":"79-40412","price":769.49,"currency_code":"USD","in_stock":true},{"title":"MC 450F - '21-'23 \/ Included","offer_id":50036751040799,"sku":"79-40412","price":769.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO__3__0000_Factory4.1TitaniumSlipOn_1_1800x1800_b3e37140-a881-423a-8c06-f7bb10df9248.jpg?v=1734372918"},{"product_id":"fmf-gass-hat","title":"FMF - Gass Hat","description":"\u003ch2\u003eFMF – Gass Hat\u003c\/h2\u003e\n\u003cp\u003e\u003cbr\u003eFMF – Gass Hat with a hilarious saying, “Mixing Gas \u0026amp; Hauling Ass” and a FMF men’s 5 panel trucker foam snapback, for a more comfortable custom fit. Now you can show off the humorous side of your personality when you’re out there hauling “you know what.” On the back of the FMF – Gass Hat has mesh back panels with the ‘FMF’ logo and FMF woven label at the snap closure. We highly recommend getting this hat with the \u003ca href=\"https:\/\/www.btosports.com\/p\/fmf-gass-tee\"\u003eFMF - Gass Tee (sold separately)\u003c\/a\u003e for an extra fun time. Check out all the best FMF products here now at BTOSports.com!\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eFMF with its roots dating back to a garage in Hawthorne, CA, former pro class racer Don Emler’s Flying Machine Factory is steeped in a rich history and heritage that lends it an authenticity and credibility not often found in motorsports. Combining his early childhood passion for tinkering with his love of racing and his natural ability for making things faster, Don transformed a local custom modification hobby into what is now known as FMF the premiere manufacturer of 100% American made exhaust pipes for motorcycles. Widely acknowledged as one of the early pioneers, Don was catapulted to mainstream success, but never lost sight of where he came from or his love of the sport. Since 1973, FMF has been actively involved in the racing community and committed to providing access across all levels of the sport while continuing the maintain the level of innovation necessary to keep them at the forefront of the field. It is the unique history that not only gives the brand a timeless nature but also the contemporary relevance necessary to appeal to spectators, enthusiasts and professionals alike.\u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr\u003eFeatures:\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFMF men's 5 panel trucker foam snapback\u003c\/li\u003e\n\u003cli\u003eMesh back panels\u003c\/li\u003e\n\u003cli\u003eFront panel embroidery\u003c\/li\u003e\n\u003cli\u003eFMF woven label at snap closure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ciframe height=\"360\" width=\"640\" src=\"https:\/\/player.vimeo.com\/video\/221625032\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/vimeo.com\/221625032\"\u003eFMF Fall 2017 Apparel Shoot\u003c\/a\u003e from \u003ca href=\"https:\/\/vimeo.com\/user2744597\"\u003eFMF Racing\u003c\/a\u003e on \u003ca href=\"https:\/\/vimeo.com\"\u003eVimeo\u003c\/a\u003e.\u003c\/p\u003e","brand":"FMF","offers":[{"title":"Navy","offer_id":50941265379615,"sku":"25014102","price":26.0,"currency_code":"USD","in_stock":false},{"title":"Bright Red","offer_id":50941265412383,"sku":"25014318","price":26.0,"currency_code":"USD","in_stock":false},{"title":"Black","offer_id":49258029220127,"sku":"25012736","price":26.0,"currency_code":"USD","in_stock":false},{"title":"Red\/White\/Blue","offer_id":50941265445151,"sku":"25014205","price":26.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO-_0000_download_002905c9-4961-48dc-9147-ee0d4e63a9ad.jpg?v=1748040842"},{"product_id":"fmf-factory-4-1-rct-slip-on-honda","title":"FMF - Factory 4.1 RCT Slip-On (Honda)","description":"\u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eFMF – Factory 4.1 RCT Slip-On (Honda)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/K00YTJdnCCc?si=lmHESxUBN69QWD5I\" title=\"YouTube video player\" style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\"\u003e\n\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFMF’s \u003cstrong\u003eFactory 4.1 RCT Slip-On\u003c\/strong\u003e is built for riders who want real power gains, a cleaner tone, and that factory performance feel without needing a full system. Using FMF’s latest Resonance Chamber Technology, this slip-on sharpens throttle response and boosts power in the low to mid range—right where Honda 4-strokes love to work. The patented core design keeps sound controlled while still letting the engine breathe, making it ideal for tracks or riding areas with noise limits.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe enlarged canister absorbs more sound, runs cooler, and trims weight, while the forward-positioned layout keeps mass centralized and protected in tip-overs. Add the simple-to-install spark arrestor for woods or enduro riding, and the 4.1 RCT becomes a true do-everything upgrade that lifts rideability in all conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThis slip-on wakes up the Honda’s power right off the bottom and through the mid range. You feel it the moment you roll on the throttle out of a corner or drive through technical trail sections. The tone stays crisp without being loud, the bike feels lighter, and the improved pull makes the whole package feel more responsive.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIf you want stronger throttle feel, smoother midrange power, and a cleaner sound without swapping your entire exhaust, this gets it done. It bolts onto the stock header, sharpens control in tight terrain, and gives you usable power that helps everywhere from moto laps to weekend trail rides.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003eWhat Does It Do?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eA slip-on exhaust replaces the stock muffler to improve flow, reduce weight, and smooth out the power curve. The 4.1 RCT uses FMF’s resonance chambers to reduce pressure spikes, helping the engine rev faster and respond immediately.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe larger canister volume absorbs more noise without restricting flow, while the patented core design maintains performance and keeps tone controlled for sound-restricted areas. Add the spark arrestor for legal trail riding, and you get a lighter, more responsive setup with stronger pull in the low to mid range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOn the bike, it feels more connected, more responsive, and noticeably stronger where most riders actually ride.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003e\u003cbr\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e• Resonance Chamber Technology improves low–mid power and throttle response\u003cbr\u003e• Patented core keeps sound controlled while maintaining performance\u003cbr\u003e• Larger canister volume increases sound absorption and cooling\u003cbr\u003e• Tuned chamber design refines flow and overall power character\u003cbr\u003e• Forward Engineering layout centralizes mass and protects in tip-overs\u003cbr\u003e• Application-specific core specs maximize gains for each Honda model\u003cbr\u003e• Rear endcap allows easy 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The Powerbomb’s expansion chamber increases flow and scavenging, meaning quicker response when you crack the throttle and smoother power when you’re working the clutch through tight terrain. It also quiets your exhaust tone naturally, making it perfect for riders who want performance without breaking sound limits.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTuned for bottom to mid-range performance\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eUp to 10% horsepower increase\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eActs as a built-in pre-muffler to reduce decibel output\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePatented FMF Powerbomb chamber improves exhaust flow\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eDesigned for full oil filter access\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePrecision-welded, high-quality construction\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eCompatible with FMF or stock mufflers\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"WR 250F - '01-'13","offer_id":49259482218783,"sku":"MF040073","price":224.99,"currency_code":"USD","in_stock":false},{"title":"WR 450F - '03'06","offer_id":50089837920543,"sku":"FMF044033","price":224.99,"currency_code":"USD","in_stock":true},{"title":"WR 450F - '07-'15","offer_id":50089760817439,"sku":"18220125","price":224.99,"currency_code":"USD","in_stock":true},{"title":"YZ 250F - '01-'06","offer_id":50089632989471,"sku":"MF040073","price":224.99,"currency_code":"USD","in_stock":false},{"title":"YZ 250F - 07-'09","offer_id":50089707438367,"sku":"18220139","price":224.99,"currency_code":"USD","in_stock":true},{"title":"YZ 450F - '07-'09","offer_id":50089760850207,"sku":"18220125","price":224.99,"currency_code":"USD","in_stock":true},{"title":"YZ 450F - '03-'06","offer_id":50089837953311,"sku":"FMF044033","price":224.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO__0000_79-0251_6f5b4ba5-19db-4676-bfdb-8a6666fcc77b.jpg?v=1726077915"},{"product_id":"fmf-factory-4-1-rct-complete-system-honda","title":"FMF - Factory 4.1 RCT Complete System (Honda)","description":"\u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eFMF – Factory 4.1 RCT Complete System (Honda)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/g4yniB4mWv4?si=70N9JsZPiJsi0j1p\"\u003e\n\u003c\/iframe\u003e \u003ciframe style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/OXiwy8b7xp0?si=AAKT3LLZV2smUOl6\"\u003e\n\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003eFMF Factory 4.1 RCT Complete System\u003c\/strong\u003e\u003cspan\u003e is the pinnacle of FMF’s four-stroke technology — handcrafted for riders who want full race-level performance and premium construction. 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The 4.1 RCT transforms your Honda with a deeper tone, sharper throttle response, and noticeably stronger power from bottom to top. It feels like a race bike the second you twist the throttle.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e This system gives your bike more power everywhere — more punch down low, smoother midrange, and better over-rev. The titanium MegaBomb header boosts torque while trimming weight, and the compact design improves handling. It’s a long-term investment in performance that instantly makes your bike feel sharper, quicker, and more responsive.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eVariants \/ Options:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e Available in \u003c\/span\u003e\u003cspan\u003eNatural Aluminum\u003c\/span\u003e\u003cspan\u003e with \u003c\/span\u003e\u003cspan\u003eCarbon Fiber End Cap\u003c\/span\u003e\u003cspan\u003e. Compatible with modern Honda four-stroke motocross and off-road models.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eFMF \u003c\/span\u003e\u003cspan\u003eResonance Chamber Technology™ (RCT)\u003c\/span\u003e\u003cspan\u003e for improved power and reduced sound\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eFactory Forward Engineering\u003c\/span\u003e\u003cspan\u003e for centralized mass and better handling\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eTitanium MegaBomb header\u003c\/span\u003e\u003cspan\u003e maximizes torque and throttle response\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eNatural Aluminum canister\u003c\/span\u003e\u003cspan\u003e with \u003c\/span\u003e\u003cspan\u003eCarbon Fiber end cap\u003c\/span\u003e\u003cspan\u003e for strength and style\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eRapid Tuning System (RTS)\u003c\/span\u003e\u003cspan\u003e for easy maintenance and tuning\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eHuge weight savings compared to stock exhausts\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eHandcrafted in \u003c\/span\u003e\u003cspan\u003eSouthern California, USA\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eMassive power gains throughout the rpm range\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"CRF 450R - '21-'26 \/ Titanium Anodized Blue","offer_id":50043548270879,"sku":"18201994","price":1237.49,"currency_code":"USD","in_stock":true},{"title":"CRF 450RX - '21-'26 \/ Titanium Anodized Blue","offer_id":50043548336415,"sku":"18201994","price":1237.49,"currency_code":"USD","in_stock":true},{"title":"CRF 250R\/RX - '25-'26 \/ Stainless","offer_id":51098591691039,"sku":"18202100","price":944.99,"currency_code":"USD","in_stock":false},{"title":"CRF 250R - '22-'24 \/ Titanium Anodized Blue","offer_id":49259507187999,"sku":"18201948","price":1349.99,"currency_code":"USD","in_stock":false},{"title":"CRF 250R - '22-'24 \/ Stainless","offer_id":50043532411167,"sku":"18202002","price":944.99,"currency_code":"USD","in_stock":false},{"title":"CRF 250RX - '22-'24 \/ Titanium Anodized Blue","offer_id":50043522973983,"sku":"18201948","price":1349.99,"currency_code":"USD","in_stock":false},{"title":"CRF 250RX - '22-'24 \/ Stainless","offer_id":50043532443935,"sku":"18202002","price":944.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO__3__0000_4f91456f-1a1c-4659-aed3-896dc85461a8_d3664165-55fd-41ba-824f.jpg?v=1734535346"},{"product_id":"fmf-factory-4-1-rct-complete-system-kawasaki","title":"FMF - Factory 4.1 RCT Complete System (Kawasaki)","description":"\u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eFMF – Factory 4.1 RCT Complete System (Kawasaki)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/g4yniB4mWv4?si=70N9JsZPiJsi0j1p\"\u003e\n\u003c\/iframe\u003e \u003ciframe style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/OXiwy8b7xp0?si=AAKT3LLZV2smUOl6\"\u003e\n\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003cstrong\u003eFMF Factory 4.1 RCT Complete System\u003c\/strong\u003e brings championship-level performance, power, and precision engineering to your Kawasaki. Designed with FMF’s exclusive Resonance Chamber Technology™ (RCT) both inside and out, this system smooths exhaust pressure, boosts power across the rpm range, and cuts sound levels — all while delivering that crisp, unmistakable FMF tone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFMF’s Factory Forward Engineering moves the muffler closer to the motor, centralizing mass for improved balance and handling. The shorter overall length helps prevent crash damage, while the patented canister shape increases internal volume, allowing more sound-absorbing material without restricting flow. Built entirely from aerospace-grade materials and handcrafted in Southern California, the Factory 4.1 RCT is made to perform, look, and sound like a true factory system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e It’s FMF’s top-shelf system for good reason — lighter, stronger, and noticeably more responsive. The titanium build and carbon end cap look straight off a race bike, and the sound is pure FMF: clean, deep, and aggressive without being obnoxious.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e This system gives your Kawasaki more usable power and a smoother throttle feel from low rpm to wide open. The improved flow helps the engine breathe easier, while the mass-centralized design keeps the bike stable and responsive. Plus, the included 94dB insert lets you fine-tune sound for different tracks or trails.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eVariants \/ Options:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e Includes complete header, mid-pipe, and muffler assembly. Compatible with optional spark arrestor and tuning inserts.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eLatest FMF Resonance Chamber Technology™ (RCT) for balanced flow and power\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePatented core shape lowers sound without sacrificing output\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePatented canister design increases internal volume and durability\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFactory Forward Engineering improves mass centralization and handling\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTitanium and carbon fiber construction for strength and weight savings\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eInnovative rear end cap for easy insert and spark arrestor changes\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTuned core specs for each specific model application\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eIncludes 94dB insert for sound compliance\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eHandcrafted in Southern California, USA\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"KX 450F - '24-25 \/ Titanium Anodized Blue","offer_id":50044106506527,"sku":"18202046","price":1237.49,"currency_code":"USD","in_stock":true},{"title":"KX 450F - '24-25 \/ Stainless","offer_id":50044106539295,"sku":"18202045","price":944.99,"currency_code":"USD","in_stock":true},{"title":"KX 450F - '19-'23 \/ Titanium Anodized Blue","offer_id":50044096938271,"sku":"18201844","price":1102.49,"currency_code":"USD","in_stock":true},{"title":"KX 250F - '21-'24 \/ Titanium Anodized Blue","offer_id":50044079210783,"sku":"18201984","price":1102.49,"currency_code":"USD","in_stock":false},{"title":"KX 250F - '21-'24 \/ Stainless","offer_id":50044080095519,"sku":"18201985","price":877.49,"currency_code":"USD","in_stock":true},{"title":"KX 250F - '17-'20 \/ Titanium Anodized Blue","offer_id":50043892367647,"sku":"79-41115","price":1079.99,"currency_code":"USD","in_stock":false},{"title":"KX 250X - '21-'24 \/ Titanium Anodized Blue","offer_id":50044079243551,"sku":"18201984","price":1102.49,"currency_code":"USD","in_stock":false},{"title":"KX 250X - '21-'24 \/ Stainless","offer_id":50044080128287,"sku":"18201985","price":877.49,"currency_code":"USD","in_stock":true},{"title":"KX 450X - '19-'23 \/ Titanium Anodized Blue","offer_id":50044097003807,"sku":"18201844","price":1102.49,"currency_code":"USD","in_stock":true},{"title":"KX 450X - '24-'25 \/ Titanium Anodized Blue","offer_id":50044106572063,"sku":"18202046","price":1237.49,"currency_code":"USD","in_stock":true},{"title":"KX 450X - '24-'25 \/ Stainless","offer_id":50044106604831,"sku":"18202045","price":944.99,"currency_code":"USD","in_stock":true},{"title":"KX 250F - '25 \/ Titanium Anodized Blue","offer_id":51098695434527,"sku":"18202084","price":1237.49,"currency_code":"USD","in_stock":true},{"title":"KX 250F - '25 \/ Stainless","offer_id":51098695467295,"sku":"18202083","price":944.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/BTO__3__0000_95d3-5c745bb81ac03.jpg?v=1734542081"},{"product_id":"fmf-factory-4-1-rct-complete-system-yamaha","title":"FMF - Factory 4.1 RCT Complete System (Yamaha)","description":"\u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eFMF – Factory 4.1 RCT Complete System (Yamaha)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/g4yniB4mWv4?si=SdLYCYLfy79kfDe9\" title=\"YouTube video player\" style=\"width: 100%; max-width: 560px; height: auto; aspect-ratio: 16\/9;\"\u003e\n\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003eFMF Factory 4.1 RCT Complete System\u003c\/strong\u003e\u003cspan\u003e is FMF’s top-shelf four-stroke exhaust, engineered for Yamaha riders who want maximum power, minimal weight, and true factory performance. It features FMF’s exclusive \u003c\/span\u003e\u003cspan\u003eResonance Chamber Technology™ (RCT)\u003c\/span\u003e\u003cspan\u003e — both internal and external — which smooths out exhaust flow, boosts torque, and expands usable power across the rpm range. Combined with FMF’s \u003c\/span\u003e\u003cspan\u003eFactory Forward Engineering\u003c\/span\u003e\u003cspan\u003e, the system positions the muffler closer to the motor for better mass centralization and handling.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eBuilt entirely from \u003c\/span\u003e\u003cspan\u003eaerospace-grade materials\u003c\/span\u003e\u003cspan\u003e, the Factory 4.1 RCT offers huge power gains while cutting significant weight compared to stock. The shorter overall length not only improves balance and handling but also reduces the risk of damage in crashes. Every system is hand-built in FMF’s Southern California facility to race-level precision, complete with a \u003c\/span\u003e\u003cspan\u003eMegaBomb header\u003c\/span\u003e\u003cspan\u003e for even broader power delivery and a \u003c\/span\u003e\u003cspan\u003espark arrestor insert\u003c\/span\u003e\u003cspan\u003e for versatility.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e It’s FMF’s most refined and aggressive setup — powerful, light, and tuned perfectly for modern Yamaha four-strokes. The sound is deep and clean, the throttle response is instant, and the whole system looks pure factory with that carbon fiber end cap.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e This exhaust gives your Yamaha more power everywhere — stronger low-end grunt, a smoother midrange, and better pull on top. It’s lighter than stock, improves throttle response, and centralizes weight so your bike feels more agile. Plus, the included spark arrestor makes it ready for both race days and trail rides.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eVariants \/ Options:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e Available in \u003c\/span\u003e\u003cspan\u003eNatural Aluminum with Carbon Fiber End Cap\u003c\/span\u003e\u003cspan\u003e. Includes \u003c\/span\u003e\u003cspan\u003eMegaBomb header\u003c\/span\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cspan\u003espark arrestor screen insert\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eFMF Resonance Chamber Technology™ (internal \u0026amp; external)\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eFactory Forward Engineering for better mass centralization\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eAerospace-grade stainless and aluminum construction\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eShorter, crash-resistant muffler design\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eMassive power gains across the rpm range\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eHuge weight savings over stock\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eNew RTS (Rapid Tuning System) for easy maintenance\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eIncludes MegaBomb header and spark arrestor insert\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli aria-level=\"1\" dir=\"ltr\"\u003e\n\u003cp role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eHandcrafted in Southern California, USA\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"YZ 450F - 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Engineered with FMF’s race-proven \u003c\/span\u003e\u003cspan\u003eMegabomb\u003c\/span\u003e\u003cspan\u003e technology, this header expands and cools exhaust gases to improve flow and increase performance without raising sound levels.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eConstructed entirely from lightweight titanium, the Megabomb is both strong and corrosion-resistant while saving significant weight over stock. Its unique bulged design acts like a pre-chamber, improving scavenging and delivering the low-end grunt of a long header with the high-rpm power of a short one. It also helps reduce sound output by up to 1.5dB, making it an excellent match for sound-restricted tracks or off-road areas.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e It’s the easiest way to unlock more usable power without adding noise. 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FMF has led the way in quiet exhaust tech for years, and the Q4 is their best version yet — a system that lets you \u003c\/span\u003e\u003cspan\u003efeel\u003c\/span\u003e\u003cspan\u003e the power without having to \u003c\/span\u003e\u003cspan\u003ehear\u003c\/span\u003e\u003cspan\u003e it. Designed with a series of internal chambers, baffles, and FMF’s proprietary multi-stage packing, it keeps the decibels down while still delivering strong, usable gains across the entire rev range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eBuilt from tough materials and designed to handle rough off-road conditions, the Q4 gives your Yamaha smoother throttle response, more torque, and a deeper, refined tone that sounds clean without being loud. It’s lightweight, durable, and fully trail-legal — the kind of upgrade you can trust season after season.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy We Like It:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e It’s quiet but it rips. The Q4 gives you noticeable power gains and better throttle control, all while keeping your sound levels trail-friendly. It’s perfect for riders who want real performance without annoying the neighbors or catching flak from the rangers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy It’ll Work for You:\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e This muffler improves your Yamaha’s low-end torque and midrange pull — right where you need it most when climbing, cornering, or working through tight sections. The tuned chambers and packing reduce sound while helping the motor breathe freely, so you get more traction and smoother power delivery. And because it meets USFS and FIM sound rules and comes with a spark arrestor, it’s ready for any trail system straight out of the box.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eLess sound equals more ground\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eMeets USFS and FIM World Enduro sound regulations\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePower gains throughout the entire rpm range\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eSpark arrestor included\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePounds lighter than stock\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRugged design for off-road endurance\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eOnly US manufacturer to offer dedicated quiet exhaust systems\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eMade in the USA\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"FMF","offers":[{"title":"WR 250F - '15-'19","offer_id":49260138791199,"sku":"18211609","price":404.99,"currency_code":"USD","in_stock":true},{"title":"WR 250F - '23-'24","offer_id":50049940029727,"sku":"18211882","price":404.99,"currency_code":"USD","in_stock":true},{"title":"WR 450F - '12-'15","offer_id":50049944715551,"sku":"18211544","price":404.99,"currency_code":"USD","in_stock":false},{"title":"WR 450F - '19-'24","offer_id":50049956053279,"sku":"18211837","price":404.99,"currency_code":"USD","in_stock":true},{"title":"YZ 250F - '14-'18","offer_id":50049935540511,"sku":"18211609","price":404.99,"currency_code":"USD","in_stock":true},{"title":"YZ 250F - '19-'25","offer_id":50049940062495,"sku":"18211882","price":404.99,"currency_code":"USD","in_stock":true},{"title":"YZ 250FX - '15-'19","offer_id":50049935573279,"sku":"18211609","price":404.99,"currency_code":"USD","in_stock":true},{"title":"YZ 250FX - '20-'25","offer_id":50049940095263,"sku":"18211882","price":404.99,"currency_code":"USD","in_stock":true},{"title":"YZ 450F - '18-'25","offer_id":50049956086047,"sku":"18211837","price":404.99,"currency_code":"USD","in_stock":true},{"title":"YZ 450FX - '19-'25","offer_id":50049956118815,"sku":"18211837","price":404.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/4314\/0895\/files\/FMF_Q4HexSlip-on_492224bb-cef0-4518-b861-1b3153d23158.jpg?v=1726080937"}],"url":"https:\/\/www.btosports.com\/collections\/fmf-shop-all.oembed?page=3\u0026type=street","provider":"BTO Sports","version":"1.0","type":"link"}