The XM module must be purchased and installed by Toyota, if you want it to be an integral part of the radio, and accessed from the touch screen. Its around $500. You can have your present XM receiver uninstalled, and put into your Prius, but it won't be controlled by the touch screen. The HID headlights on the Touring Model, and on Package 5 & 6 cars, are brighter than the non-HID headlights.
