The Yoshimura RS-4 Stainless/Aluminum Full System is pentagonal shaped muffler that features a carbon fiber cone end cap, two staged stepped baffle and striking good looks. A tapered header pipe design is used for optimal flow and performance. The RS-4 muffler features a new front cap design that functions as a polyresonant chamber. This design makes for a quieter muffler with improved mid to top end power. Comes complete with an AMA-approved sound insert installed in the muffler. Carbon Fiber cone end-cap Light weight Resonating chamber produces lower decibels Improved mid-to-top-end power An AMA-approved sound insert comes installed in the muffler
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