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One way to make those mufflers perform better is to take a 2 1/4 inch holesaw ,place it on a extension and drill out both the end of the muffler inlet and the main baffle, We have done many over the years, sound is just a llittle louder than stock and definitely a noticeable perf. improvement. Let me know if you would like more info.
Lou / AERO DYNAMICS
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