Depends on if it is an open tune or not. My tunes are open tunes. It means every time i load one i can change several things. If i go to a different tire size, i can change the 'revolutions per mile' of the tire to keep the speedometer right. I can change the 'idle', higher or lower. I can change the 'axle ratio', if i change the gears. I can change a few other things too
Little Red. 2011 V6. Automatic Trans., C&L CAI, JLT Catch Can, BBK Ceramic Coated Long Tube Headers with BBK Catted X Pipe, Axle Exchange (American Muscle) Aluminum DriveShaft, GT 500 Lower Control Arms, Koni (orange) Dampers, Steeda Watts Link, Ford Racing 3.73 Gears, Magnaflow Street Series Axle Backs and a few more mods....Wifes car, 2014 Ford Edge Limited.