Its illegal to modify your headlights, so any aftermarket HID system is illegal to install and use on a road going vehicle.
You could install them and submit your new headlamp design for approval, but nobody would actually go through all that trouble, so they are illegal.
Its like splitting lanes on a motorcycle in NYC, its illegal, but nobody cares... as long as you arnt obknoxious about it...so Dont get blue, purple or green HIDs and you will be fine.
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