I've got a 2004 de engine and was wondering what you can you ask for in the way of tuning options or is the UPREV a set package.
Typically I've read you can have..
Limits removed from 1st, 2nd, & 3rd
Max speed limit removed
Tune to run lean ( to ensure good mpg)
Can you make the map selectable to say keep the original settings then flip a switch for the UPREV settings.
Any others you know of