Yeah, it might go up, but I guarantee it wont be anywhere near as expensive to fix all the damage to your car. Anyways, call a stereo shop and see if you can add a shock sensor to you factory alarm, they can answer better. I think not many people have tried this and that's probably why you haven't gotten an answer yet. Even if you could add the sensor, it's not gonna make your car any more safe than it already is, you're better off getting an aftermarket alarm.