Specific xenon adapter for upgrading halogen headlights to HID xenon headlights on the Audi A4 B7 High quality adaptation Only one set is needed for both headlights Scope of delivery: Xenon adapter Notes: The added single wires must be connected to the on-board control unit to switch to bi-xenon as well as daylight The cornering lights will only work with the control unit for automatic leveling We also offer the wiring for the headlight washer/wiper system if desired or required Please keep in mind that in some countries it is against the law to use HID headlights without automatic leveling