Hypertech 52002 Max Energy Power Programmer for 2005-2008 Dodge Hemi 5.7L Magnum/Charger/300C Power tuning for regular, premium and E-85/Flex fuel vehicles Adjustable top speed limiter and engine rev limiter (not available on all vehicles) Speedometer/odometer recalibration for non-stock tires and rear end gears (not available on all vehicles) Automatic transmission shift point and shift firmness adjustments (most applications) Features easy plug and play design