Yoshimura - RS-4 Signature Series Full System (Kawasaki)

Product Code: yoshimura-rs-4-signature-series-system-kawasaki
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Yoshimura - RS-4 Signature Series Full System (Kawasaki)

The Yoshimura RS-4 Signature series full exhaust system for Kawasaki has been developed to win races. Adding power throughout the range and providing torque to help the KX250F get out of the gate to grab holeshots, the RS-4 system gives the rider confidence to battle with the best. The RS-4 has also been designed to save weight and add monster performance over the stock system. The unique Pentagonal-shape sleeve gives your bike that factory look while adding an exhaust note that isn’t loud thanks to the Polyresonant duplex chamber and two staged stepped baffle for increased performance. Adding to the factory look, the RS-4 includes a Stainless Steel header pipe that is durable and is finished off with a Carbon Fiber cone end cap.

For riders looking to shave off even more weight, the RS-4 Signature series for Kawasaki comes in two Titanium versions to match anyone’s factory look. Yoshimura has done it again and offered factory equipment for any rider looking to increase power on their motocross bike.

With years of involvement in professional racing, Yoshimura did not hold back in the development of the RS-4 Signature Series for Kawasaki motocross bikes. From their clean look to their fit and finish, Yoshimura exhaust systems are the built to the highest standards so you don’t have to worry about loss of power at the wrong time.

You can find all your Yoshimura RS-4 Signature Series Full Exhaust systems for Kawasaki at BTO Sports, where we have the best prices and availability for your bike. While this particular offering from Yoshimura is for the 2017 Kawasaki motocross bikes such as the KXF250, we also carry parts for KTM, Yamaha, Honda, Suzuki, and Husqvarna as well. Be sure to check BTO often for the latest dirt bike parts like the Yoshimura RS-4 Signature Series Kawasaki Full System.



  • Pentagonal-shaped sleeve
  • Front muffler cap functions as a polyresonant chamber which helps reduce noise
  • Two-stage stepped baffle
  • Carbon fiber end-cap
  • Offered in three models:
  •  - Stainless header, Aluminum can w/ Carbon End Cap
  •  - Titanium header, Titanium can w/ Carbon End Cap
  •  - Titanium header, Carbon can w/ Carbon End Cap