Superchips 3865 Flashpaq for Dodge Gas V8 Gas Truck/SUV, 5.7L Hemi - 300C, Charger, Magnum Cars Complete drivetrain tuning for your Dodge truck, SUV orperformance car, Chrysler performance car or crossover Multiple performancetunes included for all vehicles and heavy load towing for truck and SUV's Speedometer calibration for axle gearand tire size changes from 22.5 inch - 42 inch Industry leading horsepower and torque gains Read and clear diagnostic trouble codes