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The work done to develop the RS-4 silencer has borne great fruit in off-road racing -road, winning multiple Supercross and Motocross titles since its inception. Yoshimura USA's R&D department has dedicated itself to developing the next generation of RS-4, a unique design that provides an unmatched combination of power and a quiet exhaust sound. The RS-4 features a double polyresonant chamber, a stepped baffle on two levels and an innovative carbon exhaust tailpipe.
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