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      04-02-2016, 11:58 PM   #68
chris45
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Drives: 2013 F30 335i M performance
Join Date: Mar 2016
Location: Toronto, ontario

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[QUOTE=dd1981;12985667]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.

http://www.f30post.com/forums/showthread.php?t=768703[/QUOTE

I just ordered an M performance exhuast for my 335i, do you know if taking taking off the valve or flap will make it louder.

Thanks, Chris