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Originally Posted by JL8Jeff
Putting in dual 3" cats definitely knocked down the growliness of my LT1. But hearing Ron's 35th anniv GMMG car with dual cats it shows you can still get a really aggressive sound out of the LS1. He has the GMMG cat-back. I would do the cats, try fooling around with the Borla plates and then if that isn't good enough, go with the GMMG.
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I'm with jeff.... also check into the stainless works setup mines pretty quiet on stock manifolds.ypipe but i also have all 3 mufflers on it they set up the system so you can pretty much take off either the one long chambered section or the 2 littler ones anyway good luck with whatever you decide to do
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2002 Trans am ws6.. black on black bolt ons with a JS built trans, 3200 stall,TTM's w/315's, full umi adj rear suspension, strano springs/sways, and koni 4/4's
2015 Forester XT touring... STI Sway bars
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