Developed in conjunction with AMA Pro Supercross / Motocross teams, this evolutionary exhaust system combines power, light weight, and centralized mass to give you the confidence to dominate the race track.
The RS-4 is a unique design with predicated power, a side benefit of a quiet earthy exhaust note that speaks volumes for performance and offers increased horsepower and torque.
The RS-4 features all the benefits of the original RS-4 muffler, but with a unique turned-out end-cap, designed to direct exhaust heat and gases away from the bike's components.
It features a polyresonant duplex chamber, a two-staged stepped baffle and an innovative carbon cone end-cap.
Pentagonal-shaped muffler sleeve and aluminum mount bracket.
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Includes: RS-4 Aluminum muffler, stainless steel tail-pipe, installation hardware, & detailed step-by-step instructions. Features: Polyresonant Duplex Chamber Two-Staged Stepped Baffle Maximized Muffler Volume Innovative Carbon Cone End-cap Inserts for AMA Pro and other racing requirements, and USFS Approved Inserts
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