The Evolution CTS3 works through the OBDII port of the vehicle. The Evolution is used to save the stock files from the vehicle's computer and then upload the Edge calibrations. This product comes with multiple power levels custom tuned by a whole team of engineers and can be installed in minutes without ever popping the hood. The Evolution greatly increases horsepower and torque and stays mounted in the cab of the vehicle and features real-time, monitoring of vital engine and vehicle data for a complete gauge package. If you're looking for a product to improve throttle response, that extra power when towing, race down the track, increase fuel economy, or just improve the overall driveability of your truck then the Evolution is the option. Not only do you get these increase performance features but you get a monitor that offers a clean simple solution for gauges like EGT (exhaust gas temperature), Boost readings, transmission temp, load percent, percentage of fuel left, and more with the expandability to even add more with our EAS (expandable accessory system) or Edges backup camera.