Brian,

On my 1988 560SL I installed an Ungo MS5000 alarm several years ago and it works well. It is able to unlock and lock the car remotely, lock the car doors when it is first started, and it also has the feature to open your garage door as well. I would not believe you should have a problem with the current car alarms available. I have never had a problem with mine nor does it conflict with anything electrical or otherwise with the car. Hope this helps.

Ben