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Here's a little test I did. OEM cats & y pipe, no resonator on midpipe and no muffler. Will take one with no resonator on midpipe and the Sebring muffler either Friday or sometime next week.
I have done a good bit before I even joined. The problem is that the threads are so long that it is tiring to look through not saying that the people arnt amazingly helpful, it's just that some of the threads are so long. And sometimes they get off topic.