YOSHIMURA RS-4 OFF-ROAD FULL SYSTEM EXHAUST 16-18 450SX-F 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

Stainless Steel Header / Aluminum Muffler / Carbon Fiber End Cap

Yoshimura took the time to develop and test in order to deliver the best exhaust system available for the new KTM 450, and the results were worth the wait. We took everything we have learned over the last several years with our world famous RS-4 muffler and revised it with the latest materials and an updated spec that makes this new model perform.

The performance gains that were realized on this system are nothing short of amazing. The dyno tells us that this new RS-4 system gained 3 horsepower over the stock system plus increased torque throughout the entire RPM range.

Features:

• Pentagonal-shaped sleeve
• Front muffler cap functions as a polyresonant chamber which helps reduce noise
• Two-stage stepped baffle
• Repack Kits and optional Inserts are available for all models
• Series: Signature
• Muffler Type: RS-4
• Header/Muffler/End Cap TYPE: SS/AL/CF