oh okay thanks.

Is it supposed to ask what mods i have or no? or is that a part of the custom tune i have to buy?

I have a 2001 mustang gt. I'm using the in tune

i updated this when i plug it in to my car it gives me the choice of diablo tune, 87octane, and modify stock tune,i dont want to do any of those, it didn't ask anything about my car i cant even find 91 octane or custom tune myself i need help i been working on this for hours and im really frustrated

Ive been working on this for hours. updating and updating and updating. still same results. I have a 2001 Mustang Gt 5 Speed. how do i get it to run on 91 octane? Thanks for your help.