Here is a car that has headlamp adjustment, and its a CDW27 platform! Some Mondeos had the adjuster equipment onboard. I know the European Chrysler Neon does as well. Granted these are manual adjustment though.
Though, it looks like most of the current production BMWs that have HID have automatic leveling headlamps. This would be required. If a driver of another vehicle was coming towards say a BMW that was loaded heavy but its lights wern't adjusted the Xenon would temporarily blind the driver. IIRC, there was a problem with this when HID first started coming out in Europe.
Oh, and just for fun here is another link.
Clicky! Its a copy of Federal Motor Vehicle Safety Standard 108, in this, it basically states that using different lighting equipment (bulbs, housings, etc, wires are excluded) then what your car originally came with is illegal. It needs to retain all the functionality of the original unit. This is how people can remove their reflectors on a 98+ but use a stick-on in some places to pass inspection. The use of HID in non-HID lamps is also illegal. A US spec lamp (unless its a projector) doesn't have the sharp cutoff that is needed to keep from offending the oncoming traffic, or causing backdazzle in poor weather. European lamps will cure this problem, but fitting them onto your car, is illegal.
