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It's worthwhile to do the conversion to duals. You need to buy a midpipe or have one fabricated at a muffler shop, a catback exhaust (new aftermarket or GT takeoff), and hangers. Your car already has the correct mounting holes for OEM hangers if you go with a GT takeoff catback. Optional is a GT takeoff bumper cover with the correct cutouts for dual exhaust tips. I would get one for appearance sake, others may disagree.