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I know that when some design exhausts and headers......they lenghten/shorten the tubes, use larger/smaller diameters...etc to get gains in certain areas.
So I ask...does the flap open and close under certain loads, rpm's and such or does it stay closed at low rpm's then open above that with no effect on other gains?
I just wonder if doing the mod you might loose out a smidge somewhere else like low end torque and just gaining sound.
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