It's real simple. When you order the combo, they ask you what upgrades you have. Like CAI, gears, etc. Then they make the tune for you. You simply download the file to your tuner via USB connector, plug the device into your car, under your steering wheel is the plug for your chip, then you just upload the new tunes. it's that easy. Whenever you get a new modification, you send them an email telling them what you got, and they will make a new set of tunes for you. It's really simple, and their quick and have great customer service.