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most fo the after market cat backs flwo the same amount of air, the loudmouth and borla flow a bit more, but not tons.
i am not a fan of the loud mouth personally. it has a rather raspy tone and is pretty loud at anythign above idle or arpund town cruise speeds.
spintech sounds nice, magnaflow sounds nice, flowmaster sounds liek every other car on the road, and corsa costs a fotune. there is also the gmmg system, sounds ok, pretty pricey though.
i woudl sugggest just going to teh track and looking/listening for a system that suits what you want. you are really only shopping for tone and appearance in an cat back system anyway, they do not provide much of a power gain.
later
tim
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