Some 2" exhaust, a 2" generic cat off of EBay, a turbo muffler, and 2 45 degree bends and you are good to go.
Just come off the bottom of your header, go a few feat and put on the cat, go back a bit further and put a 45 degree bend to point it above your axle, mount your muffler, then a 45 degree bend to point it out the back of your rig along side your gas tank.
If you want to get fancy you can bend it again to come out the side, or to point down underneath your rear bumper.