Why would 99 conversion cost more?? All you really need is the bumper cover, 99 turns, and Stealth headlights. Dont buy the stuff like that on 3sx. You can get it much cheaper from a dealer. I paid $400 for my 99 bumper. I paid $110(in that range) for my turns. Both of those items together are cheaper than what 3sx wants for the bumper alone.
