The Audi A6 C6 model uses Hella headlight units. The well known Hella "E55" Bi-xenon projectors are used in the xenon headlights. The design and performance of the Hella E55 projectors are not that good any more. Also it's a know problem that after the years, the reflective layer in the projector will become dull and eventually burn. Our Hella EvoX-R projector is a perfect kandidate to replace this projector. It has the exact same mounting points, a clear lens, and differently designed projector bowl. Don't just take our word for it, check out the video and pictures to see for yourself! The pre-facelift model without AFS system is very easy to retrofit. Projector can be removed from rear of headlight without opening headlight. For pre-facelift models with AFS and all facelift models, the headlights need to be opened to replace the original Hella projector. You will also need the D2S extension cables. Feedback from a customer from Germany about the projectors: All goods installed and wooooh -> great headlights!! Better than ever ... My wife took our 2005 Audi A6 3.0 TDI quattro to Austria for a short ski - holiday. She was happy with the new Audi - eyes!! Installation took me quit a time, because the shrouds didn't want to come into their position and the adapter - cables had to fit in the headlight case. This was not too easy ... Then it worked, but I don't want to have that next weeks again ... ;-) All together -> best solution for our AUDI!!