Yoshimura Exhaust

Alpha's styling, fit and finish result fromm investments made in technology, combining decades of hands on experience with the latest in digital design capabilities. One look at an Alpha system and you know it's something special!

We worked with Top AMA Pro Riders to achieve maximum performance and mass centralization, and to optimize rider usability with the dual muffler setup. We achieved all this while maintaining AMA Regulation sound levels. The RS-9's uniquely sculpted Carbon Fiber end-caps feature a Tunable Insert System, so you can fine-tune power delivery and decibel levels to your specifications.

Alpha's styling, fit and finish result fromm investments made in technology, combining decades of hands on experience with the latest in digital design capabilities. One look at an Alpha system and you know it's something special!

Alpha's styling, fit and finish result fromm investments made in technology, combining decades of hands on experience with the latest in digital design capabilities. One look at an Alpha system and you know it's something special!

Alpha's styling, fit and finish result fromm investments made in technology, combining decades of hands on experience with the latest in digital design capabilities. One look at an Alpha system and you know it's something special!

Alpha's styling, fit and finish result fromm investments made in technology, combining decades of hands on experience with the latest in digital design capabilities. One look at an Alpha system and you know it's something special!

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning AMA 450 Supercross and Motocross Championship series as a rookie in the same year, and again in 2012 with the Yoshimura-backed GEICO Honda team winning both 250 Supercross Lites titles. That same R&D has been directed to developing the current generations RS-4 - a unique design that provides an unrivaled combination of power and a quiet exhaust note. The RS-4 features a Polyresonant duplex chamber, a two-staged stepped baffle and an innovative carbon cone end cap.

Yoshimura took the time to develop and test in order to deliver the best exhaust system available for the new KTM 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.