YM-264610D320 (Signature Series):
Introducing the brand-new RS-4 Full System from Yoshimura R & D of America.
Yoshimura took the time to develop and test in order to deliver the best exhaust system available for the new KTM and Husqvarna 450, and the results were worth the wait. We took everything we have learned over the last several years with our world famous RS-4 muffler and revised it with the latest materials and an updated spec that makes this new model perform.
The performance gains that were realized on this system are nothing short of amazing. The dyno tells us that this new RS-4 system gained 3 horsepower over the stock system plus increased torque throughout the entire RPM range.
It's time to change the exhaust on your KTM or Husky to Yoshimura
*Please note that there is not a carbon fiber option available for this system.
- Pentagonal-shaped sleeve
- Front muffler cap functions as a polyresonant chamber which helps reduce noise
- Two-stage stepped baffle
- Carbon fiber end-cap
- Stainless steel header, tail-pipe with aluminum muffler
- Repack Kits and optional Inserts are available for all models
Sizing Charts by Brand
Listed by brand (in alphabetical order). Here you can find up-to-date sizing charts. If you have further questions, or if we've missed something, reach out and our team can assist.
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