Hey guys i just got the SCT XCAL2, say if i upload a tune to my car right and then later i get a mod can i use the same tune to customize it or do i have to make a new one? i hope that make sense, becuase i kno it can hold up to 3 tunes but i want to know as soon as u upload a tune, does that mean you can never make changes to them. PLEASE HELP! THANKS@!!@