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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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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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