Hello all.

I have a 15 4th gen with a RaceME Ultra canned tunes (I think) bought it with the tuner already on it.

Truck drives, shifts great, no complaints.

But all of the great recommendations on DRD custom tunes I’d like to do whatever is best for the truck!

So my question is can this tuner use custom tunes or is it only the MM3?

Confused from the two.

Thank you!


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