17-20 Kawasaki KX250F Yoshimura RS-4 Stainless Full System With Aluminum Muffler
Yoshimura RS-4 Full System Exhaust The work that went into developing the RS-4 muffler has paid big dividends in off-road racing, winning multiple Supercross and Motocross titles since it's inception. Yoshimura R&D has been directed to developing the current generation RS-4 a unique design that provides an unrivaled combination of power and a quiet exhaust note. The RS-4 features a Polyresonant duplex chamber and two-staged stepped baffle for increased performance,...