The LCM's with halogens also have light level adjusters (which Xenon equipped cars do not).. so if you want to do it properly and make it look OEM then you would need a new LCM.
Might be cheaper and better just to get an aftermarket HID kit for all its effort/ cost - although you would have a few legalities running such a kit; which everyone which blinds me seem to get away with :roll: