Yoshimura RS-4 Signature Series Full System - Stainless Steel Muffler - 399000D520

Delivers huge power at a very light weight
Offers better handling thanks to a lower centralized mass coefficient
Uniquely-styled pentagonal muffler body with a carbon fiber cone end cap
Front cap design functions as a polyresonant chamber to lower dB output while improving mid- to top-end power
Two-staged, stepped baffle
Tapered headpipe delivers optimal flow and performance
Titanium systems include non-spark-arrested 99 dB motocross insert (unless noted)
Mufflers available with glossy carbon fiber, satin titanium or brushed aluminum sleeve
Stainless systems come with 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box