I did too, about a year ago
check out this thread:
http://986forum.com/forums/showthread.php?t=21859&page=2&pp=20&highlight=hid
Works great so far, only complait is an ocasional battery light when you switch them on, which goes away after pushing a spoiler button (dont ask me how its related). Im sure it can be fixed with a cheap relay kit but im too lazy to even mess with it since it works.
Great update over stock halogens, but not as good as the HIDs on my A6