You want your car protected? Then you need to get a TESLA COIL ALARM SYSTEM. Check that sucker out!! Ok, its not legal, but it looks awesome. Personally, I prefer something more low-key that is more than a simple deterrent. I'd rather use the system as seen in ROBOCOP. Fry the fuckers. Anyone recall the name of that security system? A wookiee cookie to the one who knows!
UPDATE: Ok, um, someone please make some wookiee cookies and give one to ALEX who not only told me the name of the Robocop alarm system (MAGNA VOLT), but sent me a YouTube link (below).