So yeah, basically, you buy the chip, find your computer (not a PC in your home), it's probably behind one of the kick panels, and you either place this chip between the cable and the computer, or you get to open it up, do some scraping, and wedge it on the board. (when you get it, they'll give you directions). And basically, all it does is advance to timing to get more hp. Most of the time, you get more hp, but less gas mileage, it won't make it horrible, maybe only a mile/gal. difference, but it's still different. Also, a lot of the time, you have to switch to premium fuel, otherwise you'll end up with detonation (bad thing). Like i said, that might not happen to your car and you're fine running regular, just depends on what car you have. If you buy it from some performance place, they'll probably tell you what you need to know. I hope this helped.