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      01-20-2012, 05:08 PM   #499
deadmn1337
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Drives: '08 JB E92 335xi
Join Date: Mar 2010
Location: Garden Grove

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[quote=Bmwnsxr;11183596]Yea It was probably 40 degree. Will that make a difference?[/QUOTE
the mod basically makes your car use both exhaust pipes at start up instead of closing one. So from a cold start your car will sound louder but in general it doesn't really make a big sound difference while driving when the car is warmed up. It isn't a very big difference but its there.