got the diablosport in the 6.6 duramax in the 4x4 3500 dually crew cab and it works great... in tow mode .... it will pull a frigging house down and with the 125hp program in it... she will just pin ya in your seat
get 20 to 21mpg in reg mode and 45 to 50 in 125hp mode.. pending on speed. over 70mph it drops of alot