Yoshimura 18-22 YZ450F Sign RS-4 FS SS/AL/CF

All Signature series exhaust are tested, documented and marked with appropriate EPA noise emissions labels

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

Stainless systems come with 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box