I was thinking of trying to retrofit it to my car.  Then, as I was moving my car today, to my surprise, the mirror tilted down automatically.  I know when you set the side mirror switch to the driver's side, that activates it, but I coulda sworn when I first got the car, I played around with it and didn't see it happen.  I have Sport Package, but that's about it on my 03 325Ci.  Is it supposed to be standard?  I don't recall it being on my window sticker.