Alarms are worthless.. i use to install for circuit city and Sound Advice. if i wanted your car i would just uninstall your alarm... all an alarm is going to do is deterr stupid thieves that are just out to take your radio or whatnot.. if they want your car you can better believe they know how to bypass alarms... also if you do get one get a clifford dont get dei... the ignition bypass on dei is an always off circuit then when the alarm is activated the brain sends a pulse to the circuit and opens it so it wont start. so all you have to do is unplug the dei alarm brain and the car starts.. as with clifford its the opposite.. if you unplug the alarm the car wont start so the thief has to find the circuit and reroute it. hope this helps... but like i said an alarm will only stop the idiots out to make a quick buck.. not the real theives