I was told by the cops investigating my last break-in that all thieves know that on a GM you just pry the top of the door and use a two by four to get the door open enough to unlock the door. Alarm wont sound. In my case the first time they tried this they could not pry the door enough so they just broke the front window. Second time they did not bother with prying and just broke the back window. That is why I am looking for the best aftermarket alarm.
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