If you have headers that have dual outputs, have a nice flowing Y pipe that runs the dual header pipes into a single 2.5 inch. Run that as straight as possible back thru a nice flowing turbo muffler just before the rear end, then hump over the rear end, and straight out the rear bumper. Or if it was me, I would just not put in the turbo muffler to start and see what it sounds like, then you can easily add a nice turbo muffler inline if you get tire of the sound.
I just got all the parts for mine. 6-1 header with wrap, SS 3" to a borla 24" long oval straight through muffler up and around the axle to a really cool polished SS tip.