almost every chip for a car that is worth using will record your VIN and when you program the computer, it stores all of your stock information until you change it back. You would beable to use someone's if they changed the computer back, but the owner of the chip wouldnt beable to use it again until you changed yours back to stock.
also, if you buy one, you should go with SCT. They are about $350, but you can get a computer cable to hook the flasher to your computer and change stuff as needed(you wouldnt have to pay $75 to get it reflashed incase you ever bought gears or something for your car.
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