Hypertech 42002 Max Energy Power Programmer for 2003-2005 ford Diesel 6.0L F-Series/E-Series/Exc 3-Stage power tuning; tow safe in all power levels up to maximum GCWR Adjustable top speed limiter (not available on all vehicles) Speedometer/odometer recalibration for non-stock tires and rear end gears (not available on all vehicles) Reads and clears Diagnostic Trouble Codes (DTC's) Features easy plug and play design