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      01-28-2013, 12:47 AM   #6
mkiv808
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Drives: 06 E90/Cayman S
Join Date: Sep 2007
Location: Milford, CT

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Quote:
Originally Posted by rockd View Post
The stock exhaust system comes with two pairs of catalytic converters and one pair of resonators. The Sosi X-Pipe removes the second pair of catalytic converters and the resonators.

How much more volume are you looking for (percentage-wise)? Just removing the secondary cats might not get you there...
Not that much more volume, maybe 20%? The Bastuck is pretty quiet, but I like the lack of drone. I'd like more volume in the upper frequencies.