I don't know if this has been asked here yet, but I'm looking for a fairly simple explanation.

I'm looking at getting a tuner for my truck and I think I've settled on the MM3, however I like the display of the CST2 from what I've seen.

Is there the ability to have custom tunes loaded to the CST2 and be able to SOTF, as well as transmission tuning?

Would I have to also purchase an autocal and flash the ECM to have all these abilities?

Thanks for the help!