I ran something similar (GT2+ AA HFC X-pipe) and it was 10x louder than the GT2 by itself. I took it off 3 days after installing it so I'm back on stock cats.
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2011 Monte Carlo Blue E92 ///M3 - ESS VT2-625
Last edited by BrewRifle; 07-28-2014 at 01:18 PM..
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