This Yoshimura RS-4 exhaust system was designed with one thing in mind, winning races! The RS-4 is a unique design with predicated power, a side benefit of a quiet earthy exhaust note that speaks volumes for performance. It was an obvious choice for the SX-F lineup.
RS-4 Stainless/Aluminum Full System: Full System includes RS-4 muffler, stainless steel header and tail-pipe, installation hardware, and detailed instructions. An AMA-approved sound insert comes installed in the muffler.
RS-4 Titanium/Titanium Full System & RS-4 Titanium/Carbon Full System: This Full System comes with a titanium header and mid-pipe, titanium muffler sleeve, installation hardware, and detailed instructions. Titanium Systems come with a AMA Pro Racing sound insert installed in the muffler.
* Delivers huge power at a very light weight
* Offers better handling thanks to a lower centralized mass coefficient
* Uniquely-styled pentagonal muffler body with 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
* Mufflers available with glossy carbon fiber, satin titanium or brushed aluminum sleeve
* Systems come with 96 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box
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