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I had the Summit 3" turbo mufflers on my 70 SS396 and you could actually talk to a passenger with the windows down on the highway so they weren't bad at all. I think their mufflers are made by Dynomax, either blanks or blems. I would think the Ultra Flos will flow better though.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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