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any reason why you "need" dual exhaust? I mean you must have an exorbitant amount of air flowing through your FOUR cylinders to require that much exhaust flow. Next time you see a 13 sec or faster civic, count how many mufflers they have because I'm sure their setup would demand a much higher flow rate. Not flaming ya, just trying to help you out before you get flamed for having dual exhaust.
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