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      11-21-2012, 11:43 PM   #22
gatorfast
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Drives: 528i M Sport
Join Date: Jan 2008
Location: SoFla

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Haven't heard the ACM mod in person to compare but removing the secondary cats def adds some volume.

Sounds like your best bet is to just do the oem mod and go from there. As others suggested above, an intake will add additional cabin noise without making the outside too much louder.