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I have the Random Tech cat-back with longtubes and dual cats. It's very mellow at idle and highway cruising. It gets loud at WOT over 3500 rpm's as it's a straight through muffler. Anything other than the LM1 or LM2 should work pretty well. The GMMG will be too loud as well.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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