Keep in mind that putting HID bulbs in an un-baffled reflector housing is illegal. Nevermind the fact people will constantly telling you that you are #1, if you catch my meaning? You also won't get high and low beam, just insanely bright beams with no other settings.

I already converted my Highs to HID, but can get away with that on the 4-headlight system, I still have legal halogen Lows until I can get to projectors.