I'd get a word with Ray at Double R Diesel and discuss this with him. Now sure of the MM3.

But if it was a Smarty, it's VIN locked and the original Smarty unit locks in the original tune from the manufacture, then tunes in the new settings. If you get a new tuner, would it do the same ? And if you went back to the stock tune, it would be what you have now, not the factory settings.

I'd check with Ray and see what's up.


Oh: I'd see if the dealer can find the prior owner and if nothing else, have him give the prior owner your number so you can find out if he has the tuner, what tuner it is and if you can get it.