Nine-time World Vet Champion & 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 4 strokes & is still heavily involved in the testing process. Lighter, stronger & more powerful. These are 3 qualities that riders demand from a performance exhaust. That is why R&D is the foundation of Dubach Racing Development.