Yoshimura exhaust full system Signature, RS-4, Full System, Stainless Steel with Aluminum Sleeve and Carbon Fiber End Cap.

KTM350 SX-F13-15Fitment Specs: Series: Signature; Style: RS-4; System Type: Full System; Tube: SS; Sleeve: AL; End Cap: CF
KTM350 XC-F14-15Fitment Specs: Series: Signature; Style: RS-4; System Type: Full System; Tube: SS; Sleeve: AL; End Cap: CF

The work that went into developing the RS-4 muffler has paid big dividends in Off-road Racing; winning multiple Supercross and Motocross titles since it's inception. We've developed the current generation RS-4 based on that research & development, and the result is a unique design that provides an unrivaled combination of power and quiet exhaust tone. The RS-4 features a Polyresonant duplex chamber and two-staged stepped baffle for increased performance, while a carbon cone end cap finishes off its innovative styling.

  • 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 and tail-pipe