Retrofit will cost you a bit but it is worth every penny. I know it is worth it for me because 5th headlights are the worst ones you could slap a HID bulbs in them. It gives out a ton of glares, def a ticket for it. If you do it yourself, you probably look around $500 more or less depend how cheap you get the parts, if not add ~$300 labor to it. Buy a spare headlights to work on so you don't have down time, or in case if you mess up you still have a good pair. After you finish, sell the pair you just take out from your car to get the money back.