the ppc and the car don't get married
when you purchase it, you tell them your vin #. then they program it into the unit before shipping it to you. when you plug it in your car it looks to see if it matches the one you gave when buying it. if it doesn't, then a readout on the unit says that the numbers do not match and prevents you from doing anything else. prevents people from jacking your ppc and installing it on their car first haha. imagine an unlocked ppc unit.....that would be GOLD!