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not really any hard evidence either way on this as to gains that I have seen. I have talked to D/T, Magnaflow and My long time muffler man, and general thought is on stock applications at least you would lose bottom end torque and gain 1-2 hp on top? But with headers and freeing up the system in front first, then might pickup power and not lose any bottom.Only way to tell is someone has to do it and see if there is a difference on the dyno you can for sure say came from the pipes of course.
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