Just installed my AFE Intake, CAT delete, DPF delete, and Phalinx tuner, with the 275 tune! The power is incredible! When i put it to the floor from a rolling start, either the trans slipped, or the tires completely broke loose! I'm hoping it was the tires! Shifting is a little harsh, but iv only got about 20 miles on it. What is the best way to relearn the trans? Spartan is awsome! The only let down of the night, is the exhaust! My other two trucks sounded pretty bad when they were straight piped, this one sounds like its moving a bunch of air, not much bark to it. I guess look on the bright side, this truck would smoke either of my past trucks!