Yoshimura KX450 RS-4/RS-4D Exhaust
The RS-4 muffler was developed in conjunction with the Rockstar Makita Suzuki race team with one purpose in mind: winning championships.
That goal was accomplished during the 2010 AMA Supercross and Motocross season when Ryan Dungey and his Yoshimura-powered RM-Z450 took the motocross world by storm as the first rookie in the history of the sport to dominate both series.
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.
RS-4 systems are the choice of both the Factory Honda and Suzuki teams. The RS-4 is available as a full system, in either Titanium or Carbon Fiber, and comes with an ultra-lightweight carbon fiber end-cap.
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 rock solid performance. 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.
Both the RS-4 and RS-4D has been used by both the Factory Honda and Factory Suzuki supercross teams and is the system of choice for a number of the riders during the 2011 supercross and motocross seasons. RS-4 and RS-4D systems for the 2012 Kawasaki KX450F are now available.
2012 KX450F RS4 Applications
- Stainless/Aluminum/Carbon RS-4 Slip-on
Part Number: 244702D320
MSRP – $395
- Stainless/Aluminum/Carbon RS-4 Full System
Part Number: 244700D320
MSRP – $595
- Titanium/Titanium/Carbon RS-4 Full System
Part Number: 244701D720
MSRP – $945
- Titanium/Carbon/Carbon RS-4 Full System
Part Number: 244701D220
MSRP – $995
2012 KX450F RS4D Applications
- Titanium/Titanium/Carbon RS-4D Full System
Part Number: 244701E720
MSRP – $1,045
- Titanium/Carbon/Carbon RS-4D Full System
Part Number: 244701E220
MSRP – $1,095
Click here for applications and updates.