I got ahold of diablo and they told me that I cant adjust any of the parameters on the programmer something to do with the computer not allowing me to change them and the only way to change it is to have a custom tune written for it.. What is the point of a programmer that you can adjust anything ...

Its still brand new in the box I havent tried installing it yet because ive read that you cant change the main gear & tire settings I need to change.

It seems that on some of the posted topics people are not able to change there gear ratio or tire size with the u7152. I would like to calibrate it for the tires and the new gears.. Are they not changeable??

I have a 2003 5.4L F250 with 6" lift and 37's. Just changed the gears to 4.56's and installed a k&n cai also have 3" exhaust from the headers back with flowmaster 40 series single in dual out. Just recieved my predator tuner and was wondering if I can just plug and play or if I will need a custom ...