I know many of the newer cars today come with a basic factory alarm and maybe even a factory kill switch built in with the alarm. Not much but just a little more peace of mind. However many of the luxury cars come with a electronic chip within the key to prevent starting of the car if the ignition system isn't presented with the proper code or signal. Obviously this does make it harder to steal but how much harder? I know I get a tiny discount on my insurance because my car is a bit harder to steal than the average car.