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I wonder if the rest of the exhaust will make a difference. I.E if the stock catback is left on there providing a little more back pressure, would it really matter to the engine if the headers were 1 3/4 or 7/8?
Would be interesting to see this back to back to back test with a popular - x pipe and 3" cat back setup. So you'ld have the ideal back half of the exhaust, and then the only variable being the 3 different header sizes.
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