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For those of you with the magnaflow, you know it's a very quiet system, but when you replace the cat and exhaust manifold with a race header and 2 1/4" flex pipe it will get very loud. not to worry though, since the magnaflow only has one muffler you can add a resonator (2nd muffler) after the flex pipe. Just install magnaflow part number 14415 and all will be good. I just installed one on my car and it's super quiet.

