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      11-21-2012, 08:19 PM   #21
gatorfast
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Drives: MR E90 M3
Join Date: Jan 2008
Location: SoFla

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By "non-perforated" method you are referring to replacing the 2 large perforated pipes with straight pipes right? I have that done as well. If you want more cabin volume I recommend removing the secondary cats. That will def make the sound more aggressive inside and out but will add some rasp if you are ok with that.