there are quite of few alarms that can have a kill switch relay interfaced with it. option group might be a cheap one, but it gets the job done. as soon as someone tries to start the car while the alarm is enabled, it will sound the alarm and won't let the car start. Then when you disarm it, it'll beep a certain amount of times to let you know what's been going on w/ your car. 4 chirps=tampered with 5 chirps=attepted startup.