My truck has a TSperformance 6pos chip, 6637 napa air fitler (works great), autometer gauges, 4in down pipe, 4inch back into 5inch into 6inch stacks, a bull dog shift kit, im working on getting a 6.0litler tranny cooler, and a x-wheel (and im gona make a 20psi pop off vaule for the map sensor).
I would recommend all these things for your truck they work great on mine and my tuck has 290,xxx miles on it. you dont need the stacks but you do need a 4inch downpipe and a 4inch exhaust for sure.

mine at the moment has the ts 6 pos chip with a k&n cold air intake but i switched the k&n wet filter for an amsoil dry filter and gauges and i think far as performance im gonna leave it at that for now because that made plenty of horsepower and smoke for me. the only thing i have left is the 4 inch turbo back into duals in front of the back tires.