The Dubach Racing Development (Dr. D) exhaust
systems increase power throughout the RPM
range. The unique attributes of the Dr. D Step
System allows for a more efficient intake stroke. It
does this by resisting the reflective exhaust pulse
during the intake/exhaust overlap. Features a
lightweight magnesium end cap and a 6063
aluminum muffler. 304 Stainless steel head and mid
pipe, welded construction reduces weight (no
springs). Removable bolts for easy repacking. Used
by ITP Quadcross champion Dustin Nelson.

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