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DIY: 335i Exhaust Sound Mod. Better, and even easier than golf tee mod.
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07-14-2009, 08:10 PM
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raceyBMW
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Drives: 2011 M3 w/ESS55, 2001 540i/6
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2001 BMW 540i/6
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2007 335i Coupe
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HAHA, are you serious? No way was the exhaust flap mod a cause of this. There is no horsepower lost, if anything you actually might gain a tiny amount because of the reduced back pressure at all RPM.
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