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I don't under stand why people think small piping is restrictive, your exhaust is not a steady flow, it is pulses and if you have a larger pipe it is going to take longer for those pulses to reach the end, it's not the same math you use for pluming water in a house, it is the same math as you use for musical interments, if you wanted a true free flowing non restrictive exhaust you would remove the piping all together, but if you do that your engine will hardly run!
It's still bitterly cold out but after replacing my exhaust with oem honda pipe my torque went up (the feel of more power) and my gas mileage went up, I will not have a clear reading on this untill I can compare the last 2-3 years of running a larger pipe, and the size might not seem that drastic going from a 2" down to a 1 3/4 but check out the volume of the two, BIG difference.
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