Jus letting u guys know, i have retro-fitted HID kit from MTEC. They are absolutely amazing, very big difference from the standard halogen lights. They work on all audis straight out of the box. I purchased them from: http://www.hids-direct.co.uk they cost around £140 - GENUINE MTec Product, serial number all intact. They dont cause any engine faults or electrical faults and they can easily be fitted by novice like myself. In my opinion its a very good price for a very high quality kit. So if anyone interested in upgrading lights to xenon, then this is what you need. I'v been the guinea pig and fortunately it couldnt have turned out any better. MTEC HID 6K (H7) was my kit spec, so it matches the new BMW lights.