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M Performance Exhaust muffler power gains? Plus question on sound.
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07-15-2014, 01:32 PM
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HX_Guy
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Drives: 2014 BMW M235i
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Blah. Then I guess I'll pass. I rarely ever drive with the windows down (did some test runs and prefer the sound with the windows up...with the wind noise and such, you barely hear the engine/exhaust anyway).
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