Yoshimura unveils the RS-4D muffler

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Yoshimura has taken its RS-4 and completely revamped it to produce the RS-4D, a dual-outlet muffler that was developed in conjunction with the Rockstar Makita Suzuki Yoshimura race team. The muffler has been tested by Factory Honda and Suzuki SX teams

The RS-4D features dual internal baffles that help increase exhaust gas flow rate and throttle control. It also increases horsepower and torque, especially in the bottom to mid RPM range, the company says. The RS-4D is available in full-system applications, in titanium or carbon fiber. Part numbers:

Titanium Full system: $1,045 MSRP
Carbon Fiber Full system: $1,095 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

Contact: Yoshimura Research & Development of America Inc., 800-634-9166, www.yoshimura-rd.com