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So I just did mine, not exactly with these but basically the same thing. Stock manifold with a primary cat delete, exactly at 3k rpm the thing sounds like a fart can. But only at 3k, not before not after. I'm getting a magnaflow resonator put in. Currently I have no 2ndary, no resonator, and a Remus muffler. 2.5inch piping all the way through.
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