Check out
www.neverburnout.com they got good kits, lifetime warranty on bulbs. but yeah, hids consist of a gas filled bulb which connects to a ballast which is a box, which is plugged into your stock bulb harness. I would just get a 6k kit and you should be fine, even though it will probably glare like a beyatch but i've never had a problem driving by people with hids in headlights not made for them.