When you say too loud, do you mean too loud in normal driving in traffic and under 2500 rpm's or too loud at WOT? Cats will help take of the edge but depending on the muffler design it still might be crazy loud at WOT if the muffler is a straight through design.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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