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True duals aren't really needed until you're making some serious power. It won't be cheap to go all the way out the back but dumps sounds like **** so don't even bother. Are you looking to make more power with duals or just want to say you have duals? Because I have a Dynomax Ultraflo crossflow muffler for sale that flows 1200+ cfm which will support 600+ hp easily.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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