I set my car up with a security ecu conversion harness. Basically I mixed a bunch of wires up on the car harness side and then sent them back to their right locations in the conversion harness. I take the conversion harness with me and the car will not start without it. If someone did try to "fix" the wiring it would literally take a service manual, multi meter, and about 2 hours of time. CAr also has an alarm, and multiple kill switches. The only way to steal my car is with a tow truck and at that point there really is nothing you can do about it but try some ind of GPS device which should be located in something the theives would actually take out of the car when they strip it, like inside a nice pair of seats or hidden in the engine wiring harness or something like that. For example you can take the factory iab box on a gsr and hide a gps device in there.