These days, the parameters relevant to adjusting vehicle performance are controlled by the power train control module. The PCM contains the VIN. Many off-the-shelf tuning kits contain a pre-programmed tuning maps for various vehicles. Once the handheld flashing device is hooked up to a vehicle, it download's the factory settings from the PCM along with the VIN, then uploads the "tune up". The unit is then permanently locked to that VIN. Some allows restoring the backup and allow use on another vehicle. I know that many routers have the ability to spoof MAC address so that you can use the cable modem that became locked to the computer it was originally setup with. Is it possible to build something with spoofed VIN so the unit can be reset? How about downloading all the tuning maps?