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      12-30-2012, 07:08 PM   #2
pbonsalb
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

Dinan and Borla are the two quad resonated options. You can also add resonators to your x-pipe. I added four to my aftermarket x-pipe.