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They are not legal for road use because your headlamps with HID installed were not DOT approved, they were only approved for use with the standard halogen bulb they came with. You could submit the combination for testing to get approval if the output meets photometric requirements in combination, however it is very expensive and time consuming to do so.
also check out HIDGUY.NET. Alot of the guys on fnsweet forums use him. really good prices. Just another option for you to save money. thought i would throw it out there.