I owned the bully dog and installed it on a 6.4 ford. Out of the package, the first thing is to attach it to your computer and download your specific engine data. It will tune both your engine and your transmission control. It has three different settings for power. It plugs into your computer site in your truck and will suction cup where you want it. For my 6.4 ford, it was awesome and added the power to travel to the Montana Mountains pulling a travel trailer. You do have to be careful though, it will add a lot of HP and Torque. It will spin the tires, big time. For service it is very easy to remove and re set to factory spec.