Yoshimura Inox RS12 Complete Exhaust System Yamaha WR 250 F 15-18 YZ 250 F 14-18

Yoshimura Inox RS4 Complete Exhaust System

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.