[Jeph]

To install them, you only need the tool that your car comes with. It's some kinda inverted hex wrench thing. Some one else will post the technical name.

Xenon = Litronic (Litronic is Porsche for Xenon)
Halogen = Halogen

Xenons have an optional module to install that aims the lights up when your brights are on. But cars that come with Xenon from the factory already have this unit.

1st!