Thread: DIY: 335i Exhaust Sound Mod. Better, and even easier than golf tee mod.
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      10-09-2014, 05:14 PM   #666
tomci08
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Drives: F80 M3
Join Date: Aug 2014
Location: Chicago

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Just read the whole thing and im all over the place. Did anyone have any problems in the winter time with this mod? (ie proper cat warmup)
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