The RS-4D builds on the technology that has made the RS-4 a force to be reckoned with on the racetrack, enhancing it's rock solid performance. By increasing the amount of open area at the exhaust outlet, the RS-4D increases airflow, resulting in smoother power delivery and increased throttle control. Testing has shown that it offers increased horsepower and torque throughout the power curve, especially in the bottom to mid RPM range.

Titanium/Carbon Fiber muffler construction with Carbon Fiber Dual-Outlet Cone End-cap and AMA Pro inserts.

• Complete Muffler Assembly
• Spring-mounted muffler
• Please call to insure correct replacement muffler

• Replace your scratched, dented or discolored muffler with a new sleeve
• Please call to insure correct replacement sleeve

• Repack Kits Include Space-Age Packing Material, Rivets, and Rivet Bands
• Repack should be done every 6-8 Hours of Use
• Steel Wool Baffle Wrap available upon request

• Replace your scratched, dented, or discolored muffler badge with a fresh one

• Reduce dB levels in minutes for noise sensitive race tracks or trails