Well I got a Viper alarm in my...........but you should also invest in something called Kill Switch or Fuel Cut Off Switch......they are both same thing......basically you have a switch installed anywhere in your car.....everytime you turn the car on you must press it or it won't start.....the fuel is cut of if you don't press the switch..
There are also different type of kill switches but the one I am talking about should run you for about 50 to 80 bucks
I heard that saved few peoples cars around my hood
heh hood