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Hard to tell what happened there with three parts getting changed. I'm guessing the stock header is more designed toward high end torque thus you didn't lose much top end. I would bet the nameless op/fp even with a cat flows better than the gutted stock piece if it is compared to stock overpipe and modified front pipe. The stock overpipe is a mess.
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I'm done helping those who won't help themselves.
TL;DR: 
-Duke |