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      07-14-2009, 09:10 PM   #281
raceyBMW
king of the hills
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Drives: 335i coupe
Join Date: Dec 2006
Location: Denver, CO

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1994 530i  [4.25]
2007 335i Coupe  [4.07]
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.