lets thinks outside the box for a second, how about LOW PRICES! the truck already comes with a good set of factory exhaust. sure, theres plenty of room for improvement but i cant justify spending $600-700 for a cat-back exhaust when the only thing getting upgraded is the muffler.
no kidding.
a Lightning style exit in front of the rear tire should cut a significant chunk off the price. Less pipe, less bends, less design work, less hangers needed, etc.