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So I have the 2nd cat and muffler delete and I'm thinking of replacing all the piping with 2.5 inch piping from the headers back to go with the PPE headers that I'll be ordering.
That's insane! It will be ridiculously loud, if you don't mind it by all means go ahead, you'll probably get a lot of power out of it too. Putting on a resonator / mufflers would probably be more restrictive but will be more pleasing to the ears.