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Originally Posted by Modshack
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I think there is some confusion here. You two may be talking about two slightly different things. This weekend I did a custom exhaust on my 1SS. I didn't have NPP, not sure if that makes a difference or not. Anyway I had them cut the exhaust and muffler out right before the crimp. Then I did two separate 3" pipes all the way back with 4" tips. It's way louder. Not sure if more powerful. So my question is did the Mishimoto test remove the crimps and replace with non crimped pipes before the muffler? If so, I wouldn't imagine any change in sound or HP because it's still before the muffler. I'm not an engineer.. This is just a guess.