Bully Dog 40502 Triple Dog Downloader Improved fuel economy by making the vehicle engine more efficient Increased horsepower and torque of 50-140 additional horsepower with 180-221 lbs-ft of torque Calibrates the speedometer for aftermarket tire sizes and adjusts speed governor setting Free internet software updates for optimal engine efficiency and additional features Adjustable power levels can be changed while the vehicle is in operation to maximize safety and efficiency