I have a 91 M5 and I am wanting the Xenon headlights. Someone told me you need to change the whole ballast to get the Xenon lighting.. but Pep Boyz or Track will sell Xenon bulbs. What is the difference in changing the whole Ballast?
Has anyone ever tried these Xenon bulbs? Changing $40 worth of bulbs beats doing $1000 worth of ballast work.
91 E34 M5