the replacment projectors WITH H7 halogen bulbs are far far better for light on the road than the stock units,
IF its being able to see where your going, theres no "need" to go HID with them (use the ones from RFL , see LoB's guide for who/where and how) just skip the HID headaches he has
If its for the blue tinge to your lights, just to look good/cool dont bother all that does is stick a badge on the front of the car saying "w*anker inside"
unf LoB , the wavelength of the blue/white units does actually cause the "dazzling" effect, as well as the P-poor alignment, choosing the Wrong colour temp of the hid bulbs is the cause. Fitting the natural/daylight colour temps doesnt get that , , go have a chat with an optician about colour temps and dazzling/blinding effects, its an illuminating chat
how those german cars get past the part of the regulations that cover that gawd knows, LED can be blinding , distracting and dazzling all at the same time which IS illegal as per the construction and use , and road lighting laws...but probably like indicators that bmw/audi tw*ts never use its just ignored.