There a thread already regarding them mate
THIS HEADLIGHT IS NOT FOR YOU - IF:
1. Your car has automatic headlight on/off feature (with this feature in the Auto position your headlight will turn on automatically when the sensors detect "darkness").
2. Your car has automatic rain initiated windshield washers (with this feature your washers will start automatically if the washer stalk is in the Auto position, when the sensors detect "rain"). thats me out then !
3. Your car already has HID Xenon for Audi - see exceptions
A) A4/S4 B5 with HID - OK to replace
B) A6 C5 with HID - OK to replace
C) Audi TT 8N with HID - OK to replace
D) All other vehicles with auto-leveling - see Special Section on Headlight Leveling.
So why do we say this? We want the installation to be easy and simple. Cars with the above features will most likely develop technical problems for which we cannot be responsible. So it's not that you cannot order the Optek's (many have), it's just going to be a problematic installation whereby there may be extra cost issues.