Well, I will say that these mufflers (dumped) drone 90% LESS than the old 2-chambers (with tailpipes) that I replaced. That was the biggest reason I made the switch. I don't know anything about the "Deltaflow" line because my Flowmasters were the original 2-chambers, but the Dynomax pieces are also quieter..... Just to give you more info to bat around.
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