Adding to the usable and tractable power is how we make the new YZ450F even better. Now there can be more power to rip holeshots, yet making the bike user friendly at the end of the moto when your right hand gets a little frisky.
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 Poly-resonant 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 poly-resonant chamber which helps reduce noise
- Two-stage stepped baffle
- Carbon fiber end-cap
- Stainless steel tail-pipe
Repack Kits, optional Inserts and Spark Arresters are available for all models
Instructions and Parts Diagram
Instructions / Parts Diagram