I want to get the factory alarm, just so I have keyless entry. I'm not too worried about security because it's pretty safe around here, but keyless entry would be handy. I want the factory one so I can just plug it straight in with no worries. I have a 11/89 buil 525i, and I found a green plug near the fusebox under the back seat that I assume is for the keyless module. When looking through the wreckers, which cars have a compatible units??? Are all E34 alarms compatible, how about E32?