If its a 2013 up 5.7 you can do the same exact thing for free.
If you run the pedal monster it disables traction control and enables tow haul mode1st and 2nd gear.
Just hit the two buttons and drive it for a day and you can decide if you like it.
MPG actually improves more than youd believe. A solid half mile per gallon.
Throttle response is almost too sensitive down low.