Yoshimura RS-4D

Look at that bad-arse dual-outlet and the glossy carbon fibre sheen on this pipe. Ryan Dungey won the 2010 AMA Supercross and Motocross championships using the Yoshimura RS-4D’s predecessor, the RS-4, and now he’s stepped up to this bad-boy.

The RS-4D boasts a unique dual-outlet design that increases the amount of open area at the exhaust outlet. With dual internal baffles, the RS-4D 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 is available as a full system, in either Titanium or Carbon Fiber, and comes with an ultra-lightweight carbon fiber end-cap.

The RS-4D 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. RS-4D systems for Honda and Suzuki applications will be available soon.

The Titanium system will set you back $1045 MSRP while the Carbon Fiber system is a little bit more expensive at $1095 MSRP.

2011 RM-Z450 RS4D
Carbon Part Number: 219201E220
Titanium Part Number: 219201E720

2011 RM-Z250 RS4D
Carbon Part Number: 218301E220
Titanium Part Number: 218301E720

2011 CRF450R RS4D
Carbon Part Number: 225801E220
Titanium Part Number: 225801E720

2011 CRF250R RS4D
Carbon Part Number: 228401E220
Titanium Part Number: 228401E720

It will be made available to the public soon: https://www.yoshimura-rd.com/t-NP_RS-4D.aspx