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Discussion Starter · #1 ·
I have been adding mods now my exhaust is a bit louder than I prefer, does going back to stock muffler (I did hold on to them) hurt any performance?

I am at 640 WHP, upper, lower, injectors, cam, headers, gutted Cats, Corsa sport mufflers, I added a set of Vibrant resonators, that seemed Fine until I gutted the Cats.

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