Hypermax flash tool is the simplest of performance upgradess. Simply plugs into the OBD II under the dash and re-programs the factory computer with the Hypermax calibration within minutes. Choices are 300 BHP and 660 Ft./Lb., 330 BHP and 720 Ft./Lb. and stock. Simple 2 button control Read out the stock file which is saved for later when 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. Simpy 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