Porsche uses Litronic H7 Bulbs as an option. If I remember correctly, Litronic Bulbs are supposed to be crap. How do they differ from Xenons? Anyone knows who makes them and how much they cost. Will they work in the A4 (U.S). Below is a paragraph that was copied from Porsche's Web Site, The link to the paragraph is below that.<p>Litronic Headlights with Dynamic Range Control <br> The 911 Carrera 4 is available as an option with Litronic headlights, special<br> gas-discharge units illuminating the road ahead far more brightly and thoroughly and<br> thus significantly improving safety at night. A further contribution to your extra driving<br> safety is the dynamic headlight range control considering not only the load the vehicle<br> is carrying, but also any change in body angle (sway) due to dynamic driving<br> conditions. The halogen bulbs (H7) for the high-beam headlights are surrounded by a<br> particularly efficient free-space reflector. Whenever the driver activates the high<br> beams, the low-beam headlights remain switched on and also move their own beam<br> up by way of headlight range control in order to improve illumination of the road ahead.<br> A further feature of the Litronic headlights, finally, is the headlight cleaning system. <br><ul><li><a href="http://www.us.porsche.com/english/news/pressreleases/carrera4/technical.htm">Porsche 911 Technical specs</a></li></ul>

<ul><li><a href="http://www.us.porsche.com/english/news/pressreleases/carrera4/highlights.htm">Porshe Carrera highlights</a></li></ul>

Litronic is Porsche's trademark name for their Xenon HID headlight system. If you wanted to buy the whole assembly (lights, wiring, balasts, etc) you could try to make it work in your car. TRY being the key word. The Litronic headlights were also an option on the 993. If you happened to buy a 993 without the LItronic headlights you could buy a conversion kit for around $1250.<p>JohnS<p><br>

H-7 are only for the high beams and not the High Indensity low beams..<p>Dmak 1.8TQMS