If you are willing to spend 400 and dont want to install, goto circuit city, they have a viper alarm there for 400 installed i think. Has the 3 motion sensors, one for your trunk, motor, and in the cabin. Has a pager with a display screen on it and glass sensor. My buddy works there and had one installed on his car, says it is well worth money. Can have your windows down and if someone reaches in the window/sunroof it will go off.