These closed-course race systems utilize the latest DMC technology to deliver big gains in acceleration, horsepower and torque throughout the entire power band while meeting AMA Sound Requirements. DMC has ...

At the top of nearly every four stroke exhaust shootout, the Dr. D system stands second to none in research and development. No one has more hours in the testing ...

MRD has been producing racing components for many types of engines for over 20 years. Our stainless steel exhaust systems give you more power, lighter weights, and look trick! Reasons ...

Complete exhaust system with head pipe. Magnesium end cap that is both AMA & FIM legal. Tunable competition end caps. Aircraft grade aluminum inlet caps to reduce weight. Billet aluminum ...