Originally posted by Mystikal
xenon = hid, projector = ellipsoid.
For an E34, you already have the ellipsoids, so you can just buy an HID kit for your housing. It won't work as well as say OEM xenon's in an E39, but it's the best you can do with that platform, and will be significantly better than halogens.
not all E34's came with elipsoids, 92 and 93 didnt' come with them for some weird reason.