Bully Dog 40300 Performance Management Tool Improved fuel economy by making the vehicle engine more efficient Increased horsepower and torque of 115-140 additional horsepower with 180-221 lbs-ft of torque Digital gauge that displays and monitors over 20 different vehicle parameters Calibrates the speedometer for aftermarket tire sizes and adjusts speed limiter setting Adjustable power levels can be changed while the vehicle is in operation to maximize safety and efficiency