Yoshimura 17-20 CRF250L RS-4 SO SS/SS/CF

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

Stainless steel muffler sleeve

System comes with 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box