DR.D 4 Stroke Exhaust

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Nine-time World Vet Champion and four-time World 4-stroke Champion Doug Dubach is a heavy hand in the world of motocross. Doug has pioneered much of the MX technology in modern four strokes and is still heavily involved in the testing process. Lighter, stronger, and more powerful: Three qualities that riders demand from a performance exhaust. That’s why R&D is the foundation of Dubach Racing Development.

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DR. D 4 Stroke Exhaust Systems

The Dubach Racing Development (Dr. D) exhaust systems increase power throughout the RPM range. The unique attributes of the Dr. D's Step System allows for a more efficient intake stroke. It does this by resisting the reflective exhaust pulse during the intake/exhaust overlap. In plain language, the carefully tuned steps in the system gives a crisper throttle response from bottom to top. The key advantage of the Step System is improved low, mid and top end power. Rejetting is not required, and the Dr. D exhaust systems meet the AMA 102dB sound level requirements.

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