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The RPT designation comes from adapting the design from our Race-Pro four-inch muffler into this three-inch size. The bodies begin as three-inches at the front until they expand to three and a half inches at the rear. The black tip is also the Race-Pro machined design that's held in place with 12-point bolts.
DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES