Hey man, think your referring to the halogen to xenon. Halogens don't come with corona rings, so for now, the only way to do it is to retrofit is with xenons.
I'm trying to get a few dollars together to speed it up, if you are keen:
http://www.f30post.com/forums/showthread.php?t=794033
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So far: 200cell downpipe, custom exhaust, lifhtweight splitter, m4 comp seats