Yoshimura Rs-4 Comp Series Complete Exhaust With Stainless Header

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. features a polyresonant duplex chamber, a two-staged stepped baffle, and an innovative carbon cone end-cap. durable high-grade stainless steel tapered header and mid-pipe. considerable weight reduction. carbon fiber end-cap comes with a u.s.f.s.-approved spark arrested insert installed in the muffler (most models, see notes). step-by-step directions and all necessary hardware included for an easy installation.