If you're gonna do it for show, why not make one real pipe, and one fake one that doesn't connect to anything coming out the other side?
Well.. it was an idea
If you're gonna go to the trouble of dual exhaust, I say you might as well go do a vortech v6 or some sort of v8 swap.
But if you insist, I think you'd have to have the exhaust exiting around the rear wheels, as there is not enough room around the gas tank to run dual pipes.
I know I've seen it done on a YJ with a v8, but I can't remember who that was.