Quote:
Originally Posted by hunternight5
Quote:
Originally Posted by r33_RGSport
Is the muffler still stock?
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Yes muffler is stock but I'm gonna keep it that way it's loud as it is and it's to much work getting it done been there done that when I had my F10 M5
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It could be where the bottle neck is.
You may want a less restrictive muffler.
But before that, do a dyno first like
onfireX5 said.