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If I may interject, it doesn't really matter what long tubes you go with, as long as you get long tubes and the matching company's off road x pipe. From there, I wouldn't recommend the Corsa axle back. Over priced and too loud/red neck truck sounding. Rather, find yourself some used GXP mufflers. They flow plenty and will have ZERO drone while cruising, but sound gloriously nasty free revving and under WOT, when paired with long tubes.
Performance wise, the gxp mufflers flow plenty well for anything you want to do with the car, but wont have that drone. .