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GM makes a GMPP Performance Exhaust (muffler) for the GFX. I ordered mine but I am waiting on the GFX an the car still. The whole deal was about 750. I am pretty sure it is through Borla or Corsa. uTub has a Black 2SS with it so you can hear it. Search for 2010 Camaro GMPP Exhaust and it will come up
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