I think you can bust the windows out and it doesn't trigger the alarm either lol. Factory alarms are a joke for security. They are just keyless entry systems with a horn attached.
If you want security. Go after market. Have it hooked up to GPS tracking, page your smartphone, tilt sensors, glass break sensors, shock sensors, etc.... Still may not prevent a theft, but you'd be paged right away on your phone to know about it.
Sent from my iPhone 4S