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4-Stroke Exhaust Systems

Complete Four Stroke Dirt Bike Exhausts

Everyone wants to give their bike a sick exhaust system to help them gain a few pounds of torque and squeeze a few extra horses out of their 4-stroke dirt bikes. BTO Sports 4-stroke dirt bike exhaust systems from some of the best brands in the industry!

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4-stroke Dirt Bike Exhaust System

Whether you are an avid motocross racer or just someone looking to give their dirt bike a new exhaust system, we will have the perfect four stroke exhaust system for you. With top brands to choose from like FMF, Pro Circuit and Yoshimura, you will be able to find the right exhaust system for your dirt bike.

FMF Dirt Bike Exhaust System

FMF 4-stroke exhaust systems are some of the most sought after dirt bike exhaust for various reason. FMF makes their exhausts from hand and uses CNC Machining to ensure you are receiving a high quality racing exhaust you can count on. They make a wide variety of four stroke dirt bike exhausts so make sure you look at all of them before you make your purchase. BTO Sports has great deals on FMF four stroke exhausts like the Factory 4.1 RCT complete system. This exhaust system is made to win races!


The FMF Factory 4.1 RCT complete exhaust system is made with the highest quality blend of alloy titanium and comes in a couple different color variations: a natural aluminum muffler and the blue anodized titanium muffler. The titanium alloy Factory 4.1 dirt bike exhaust is lighter than ever and will help knock off a few ounces from your dirt bike. This 4-stroke dirt bike exhaust system will be slightly quieter than the stock exhaust, but with the great technology and engineering that FMF puts into all of their exhausts you feel the true power of your dirt bike. The newly designed Supercross header is made with a “U” shape that increasing low and mid power while providing the rider with optimal top end gains. Equipped with the new RTS (Rapid Tuning System), this four stroke exhaust makes for an easy installation process of sound inserts and US Forestry approved spark arrestors.

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Pro Circuit Four Stroke Dirt Bike Exhaust system

Another top of the line 4-stroke exhaust system that we have here at BTO Sports is the Pro Circuit Ti-6 Pro Titanium exhaust system. Pro Circuit is a leader in aftermarket performance parts and makes some of the best motorcycle parts in the industry. The Ti-6 is no exception! This high performance racing exhaust is made to give professional riders a leading edge over the competition as it increases power through various levels of the RPM range. It is constructed from high grade titanium in the head pipe, mid pipe, and the canister, and is finalized with the sick carbon fiber end-cap. The pipe and aluminum muffler bracket are machined to help increase strength, durability, and will provide you will a great fit. Installation is made easier with this exhaust and to top it off, this exhaust is made right here in the USA.


The T5 is another 4-stroke exhaust system made by Pro Circuit and is designed to improve power, reduce weight, and bring a smile to every riders face. Made with 6061 T-6 aluminum, this Pro Circuit exhaust will help your dirt bike shed some weight without compromising durability. The Stainless steel head and mid pipe help make this happen and will give your dirt bike a sick new factory look. Even if you are not a track rider, this pipe will let you ride through national forests around the world as it comes with a USFS approved spark arrestor.

Yoshimura 4-Stroke Exhaust System

Lastly, The Yoshimura Comp series RS-4 is a full racing exhaust system. Made specifically for increasing power and decreasing weight, this new Yoshimura four stroke exhaust is used by Factory teams in the AMA motocross and Supercross series. Trusted by the pros, you can guarantee that this four stroke racing exhaust from Yoshimura will give your dirt bike a quiet, yet deep exhaust note. Made with stainless steel header and mid pipe, this pipe is ready to race!