Can't speak for the newer trucks but I have a 2010 Challenger. I have a Diablo Predator and had a custom tune done on a dyno. I have the same mods on my Challenger as you do on your truck, CAI, exhaust, catch can and a tuner. They put it on a dyno with a wide band O2 sensor in the exhaust and did a custom tune, which was just a matter of bumping up the timing and leaning it out a little bit. I gained no horsepower or torque from the custom tune vs the canned tune, but it did widen the curves out on the lower RPM's and the higher RPM's. I can't remember what they charged me, maybe a $110 and it was pretty cool to see my car on the dyno, but from a performance point of view, I didn't gain much.
2004 3/4 ton Quad Cab, 24 valve 5.9 Cummins