The Yoshimura RS-4 motocross muffler was developed in conjunction with the Rockstar Makita Suzuki race team and now the new RS-4D builds on the technology that has made the RS-4 a force to be reckoned with on the racetrack, enhancing its already solid performance.
The RS-4D system boasts a unique dual-outlet design that increases the exhaust gas flow rate, resulting in smoother power delivery and increased throttle control, and offers increased horsepower and torque throughout the power curve, especially in the bottom to mid RPM range where riders need it most. The RS-4D motocross is available as a full exhaust system, in either Titanium or Carbon Fiber, and comes with an ultra-lightweight carbon fiber end-cap.The new Yosh pipe has been in use during pre-season testing by both the Factory Honda and Suzuki SX teams and will be the system of choice for a number of the riders during the 2011 Supercross season. 2011 Suzuki RM-Z 450 RS-4D
Carbon Part Number: 219201E220
Titanium Part Number: 219201E7202011 Suzuki RM-Z 250 RS-4D
Carbon Part Number: 218301E220
Titanium Part Number: 218301E7202011 Honda CRF 450 R RS-4D
Carbon Part Number: 225801E220
Titanium Part Number: 225801E7202011 Honda CRF 250R RS-4D
Carbon Part Number: 228401E220
Titanium Part Number: 228401E720The Yoshimura RS-4D exhaust systems for Honda and Suzuki applications will be available soon. The titanium full system has a MSRP of $1,045 while the carbon fiber full system goes fro an MSRP of $1,095.