+1 on this. I picked up a used Diablo InTune for $210 and put the 87 octance tune on along with an Airaid Intake (MIT with K&n Drop in)... pretty noticeable difference. Transmission is alot quicker and firmer, and has smartened up alot. Truck is noticeably quicker also. HP wise, maybe 15-18hp between the two mods....But I am looking to have Lew at Diablew do a custom tune for me!