not super hard... it's probably not a true dual exhaust meaning it is not one exhaust sytem per each bank of cylinders. that look can b done by getting a muffler shop to add a Y pipe to join the second muffler over to the main exhaust piping. look under a honda accord v6 to see what i mean. there is plenty of room on the other side of the spare tire well and gas tank for another muffler, u just have to have a cutout made for the tip.
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