The E89 Z4 with HIDs have a flat beam pattern and if you take your car to Europe for a holiday you will have no problems and will not blind cars coming the other way but if like me you are going to export / register your car in Europe, Spain in my case it won't pass the MOT (or european equivalent). I had to take the wheel off, remove the wheel arch lining and remove the xenon bulb to get to a lever which you pull up to change to beam pattern for driving on the right.
Beam deflector stickers won't do anything since the beam pattern is flat and there is no marking on the headlight lenses as to where to apply them.
