I just got Jerry's tune about a month ago and it is great but with the Diablo i can (I think) put the tune that is in my car ,,,stock or upgrades, into the diablo along with a stock suppied by Diablo,, i can get tune for 93 pump gas for the street, 93 pump for the track set up (incase i can't get 100 oct unleaded) or i can tune at the track for 100 oct or 110 oct if i want,, the Diablo will have a few, maybe 4 tunes in it for you to pick at will. jim