Thank you, for your warnings. I checked this deal more carefully. Some expert told me that just replacing ordinary headlights to original xenon lights will not effect negatively electrical system of the car but to do it professionally it is not enough. Also you need to replace old light and check-control module to 61 35 8 377 398 or 61 35 6 909 508 (I do not know what difference between them) and add control unit (61 35 8 360 007) with sensors for automatic levelling of lights. All cars in Europe with xenon lights should have automatic levelling device. But I thing it is not big loose to do it manually. Also there is some ways how to deceive car computer do not show warning messages. Now I agreed before payment to have xenon lights for one week for tests and thanks to “face lifting project”, I managed to install them very easy. I should say that I do not want to take them back because it is really fantastic. Of course, I am not 100% sure that this information is correct and hope that somebody will give more advices.