Yoshimura Race Series RS-4 Stainless/Stainless Full System (No CA)

Details

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the 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. The RS-4 features a Polyresonant duplex chamber, a two-staged stepped baffle and an innovative carbon cone end cap.

• Pentagonal-shaped sleeve
• Front muffler cap functions as a polyresonant chamber which helps reduce noise
• Laser-cut heat shield on polyresonant chamber
• Two-stage stepped baffle
• Turn-out carbon fiber end-cap
• Stainless steel header and tail-pipe