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As seen here on the E-Town tarmac, the UltraFlo is a straight-through muffler for maximum flow and power. It is built with CRF (continuous roving fiberglass) to provide better sound absorption (more area) than a glass pack, while delivering a powerful sound. Take notice, most of the F.A.S.T. (factory appearing stock tire) class racers use UltraFlo mufflers.