I have the superlift correction installed. and it works great, its called TRUE SPEED . if you have a chance to use a GPS, do it , it makes it easy and as true as possible.
also the dealer can only reprogram with in a certain range. and your out. the nice thing is your brakes and overhead console will work like new, or as good as new gets. if i remember correctly i turned the screw about 2 full turns to get mine to = the gps unit. hope this helps. Oo.