Have a read here and if you get stuck google ( audi-sport.net/ subject, enter )Anyone?
Do a search in the 8P forum....there’s plenty of info.
I fitted single Xenons in June/July 2016 and it was relatively straight forward , although not without its own problems .I posted several posts about the job...
Bi-xenons are even more work and require wiring adapters.
Be prepared for plenty of doom and gloom merchants to come along and say you need to install self-levelling suspension and headlight washers when retro-fitting xenons, you don’t.....
Heya !I have a 2006 and retrofitted Xenons last year, I posted sort of a guide. As mentioned no adapters needed but I fitted the washing system to pass MOT, did away without self-levelling for now but I want to fit it at some stage to make sure it's a complete retrofit and to be a good motorist and not dazzle other drivers with misaligned xenons