Hypermax flash tool is the easiest of performance upgrades. Simply plugs into the OBD II plug under the dash and re-programs the factory computer with the hypermax calibration with in minutes. Choices are 300 BHP and 660 Ft./Lb., 330 BHP and 720 Ft./Lb. and stock. Simple2 button operation. Read out the stock file which is saved for later fo returning the vehicle back to stock then program the power of your choice. Upgradeable through email with available software and a USB cable. Great for dealers who program multiple vehicles. Simply read the PCM code then email it to us then we can send you the proper calibration for the vehicle. Works on 1999-2003 7.3L and 2003-2007 6.0L powerstrokes