For the 04+ they are simply plug, play and enjoy.

When you get your package the contents are:

HID Blubs
Ballasts
Wires

And all you have to do to install them is:

1. Take old head lights out
2. Plug wire into old headlight wiring and then into ballast
3. Plug other wire from ballast into HID bulb
4. Put bulb into headlight housing
5. Put housing back on and enjoy!