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Old 10-01-2012, 07:36 PM   #14
Drives: 2010 2SS/RS A6 & 2011 1LT/RS
Join Date: Apr 2012
Location: San Diego, CA
Posts: 3,491
Originally Posted by jameslk350 View Post
Are you saying that aftermarket catback exhausts also result in zero gains or just the NPP exhaust?
Yes after market catback systems offer 0 gains. Purely enhanced sound.
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