The golf s has halogen lights. The lighting package is only available on se and sel trims. If you want OEM golf hid (or even OEM golf R), you need to switch out the wiring harness and cecm, as well as a ton of VCDS coding. There are some threads on it. It will take many many hours, cost a lot, and give you a big headache. This is all without the cornering or adaptive leveling. I looked at it and had no desire to even attempt that
Your best option is to go with a Chinese replica. (Please let me know if there is a non-Chinese replica for $500 and I might switch mine). Among them are helix, winpower, and eds. From the golfmk7 forums, eds is the best. Here is my write up on it
http://forums.tdiclub.com/showthread.php?t=483175
Overall I'm happy with them. Happy enough. I do wish there was an easy way to get OEM