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I take it your GP is 3". Is it the type that runs two pipes instead of one like the ni dual or ss auto? Cause I thought I read that with two pipes its quieter. Do you still have your cat? I do, and I won't be getting a header, so it can remain. So I hope that helps. My exhaust basically looks like an exmag, but with a straight tip and resonator. I dunno alot about it. Like I said I will see hopefully on mon.
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