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      11-12-2012, 10:49 PM   #5
Kapetan Svog Života

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Drives: 2012 335i sport
Join Date: Dec 2010
Location: Chicago

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Originally Posted by justinnum1 View Post
did you do the mod to keep the flap open? did you notice a difference after doing it?
Yes I did the mod before I even bolted up the exhaust. I cant say what kind of difference it made because I never had the exhaust on the car while the valve was operationa. However I can say that I did the valve mod on my stock exhaust and it made it a little deeper. Not much but you will tell a slight difference.

Here check out my DIY.
Custom Modified OEM Muffler,