Yes it can only be used on one truck at a time. It is off of both trucks and ready to tune yours. You may have to plug it into a computer to get new updates from the Diablo site. Any other questions let me know.
It was somewhat hard to tell as I put the exhaust on a couple weeks before the intake. It did sound like the whole system can breathe better now. I was trying to rev it up to hear if I could hear more of a whine from the intake as I have with previous intakes on vehicles but I couldn't really. I still think it made a difference just wish I would have tried it before doing the exhaust.
Can you run the Diablo intune on 93 octane and use a combo of E85 and 93? I ask because I usually get E85 when I'm close to home and 93 when I'm places that I cannot get E85.