Dinan D660-0002 Stainless ExhaustDinan's Free Flow Exhaust for 645 models provides improved flow and the resulting power gains without the excessive noise and ''boominess'' associated with typical after market mufflers. The mufflers feature ridged and durable cases, manufactured from 100% 20 gauge 304 stainless steel inside and out for optimum resistance to corrosion. Internally, the systems feature Dinan's Tuned Resonance Chamber Technology, providing the optimum balance between
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