Because they are not plug&play, if you read what I wrote before I said I "adapted" OEM xenon, just because it isn't a plug&play setup doesn't mean it can't be done. If you are a little bit handy you'll manage to adapt them, if not take them to an installer or someone who has some knowledge in the matter. Here's a thread I did when I purchased them, you can see the xenon in one of the pics. This thread was because mi X is canadian spec and I didn't have a way to power the AE's but solved that.

http://www.xoutpost.com/bmw-sav-foru...ng-lights.html