I have been meaning to do a write up on this for a few months and seeing as I had 30 mins to spare here goes. I have my rns-e installed now since may or june of this year. Works great I even traveled from Ireland to Essex during the summer which was Ferry to Fleetwood and then drove the rest of way to Basildon. Excellent setup never got given a wrong turn and the instructions always came well in advance of what turns were coming up etc also it reroutes you when it recieves traffic jams and crash reports which is nice. The only feature that will be lacking will be the arrows and directions given in the dash this is not a problem because you have a pleasant voice telling you all the directions (we call her Margaret lmao with her posh english accent and all) Before you ask no it does not tell you where the speed traps are unfortunatley. Parts you will need are: RNS-E NAv plus unit from an A6 C5 Kufatec Can simulator. Satelite antenna and A4 B5 rns-e iso harnesses for radio etc The Map DVD Double din Cage and housing. Double din air conditioning control unit DOUBLE DIN ASHTRAY Optional but I got it coz im a smoker. First off: you can fit an A6 RNS-E NAV plus in a B5 A4 quite snuggly and it is the most advised one to get as its the nearest fit you are going to get. The unit to be looking at getting has part number: 4BO O35 192P. I got mine from Poland on ebay.pl I will try to get you his name later. He is reliable and he mostly sells these at auction. He also included the sattelite antenna and misc. wire harnesses for radio etc and an original 2007 map dvd for all of europe along with a backup copy. Just be careful dont buy off just any Polish guy as they can be dubious in Poland as you might have seen a previous post of mine A4 b5 vs Polish police car LMAO. Can simulator: You will want to get a kufatec canbus simulator which is just a small unit which will translate certain codes into a language the rns-e will understand (mainly to turn on and off with ignition and to luminate the rns-e buttons when you switch on the lights) Without this it would be quite annoying. They aint cheap though at about 80 to 100 . But tbh it is something that you possible could get away with not using it but I WOULD ADVISE you to buy one because of the risk of accidently leaving rns-e on and battery going flat on you while you are sleeping. ~So get a kufatec! A/C unit: You need an A4 b5 dbl din unit. The top of the unit will overlap the rns-e which cosmetically isnt too pleasing so what I did and a few other ppl I spoke with on navplus.us was to sand down the bottom of the rns-e with a file and some sandpaper. Now it fits nice and snug. Double din: You will need one of these if you have a single din radio. These are quite hard to come by on ebay and quite pricey from the stealers. I think it can be customised to fit into the single din surround but I just got the double din housing with cage all togheter (sometimes you can get lucky on ebay) I also got a dbl din ashtray from ebay. Now something that isnt discussed much is that there are two types of gearstick surrounds a single din one and a dbl din one. I of course had a single one. I wasnt aware of this and was quite annoyed when I noticed it would not fit right so I then got the hacksaw to it ( I made a balls of that bit the cut was very uneven coz I was getting imaptient! ) I emailed vag parts a few months back and they said they have two types of dbl din gear surrounds -Piano black- which if i remember correctly costs £20 to £30 and they also have a -carbon fibre- one for a whopping £150. I will be getting the piano black one to match the rest of the interior at some stage not that I would pay that much for to the carbon one anyway!!!. Any questions? If you would like me to take some pics or want me to guide you more on how to install one let me know. It sounds very daunting but tbh the fitting of the dbl din cage was the tricky part and the filing for cosmetic looks was the labour intensive bit. It really is not as hard as it seems honestly. Locating all the parts are the time consuming bit took me over a month and a half to get all my stuff togheter as I set a budget before hand so I always kept to my budget when bidding. I think in all it cost me in euros 1k give or take. An excellent addition to the car and when I do decide to sell the car I think ill get an A6 C5 and take it with me lol. The actual fitting of the rns-e is basically plug and play. I didnt have to Vag com or anything as you just leave it on the A6 coding and it will learn with the adaptive technology built in to the rns-e what size wheels you have etc (usually after 200 or so miles). If you have made it this far without nodding off fair dues to you as I do ramble a lot at times lol . N.B. If anyone is interested I have a spare double din cage and housing listed in the classified section of the forum so that would be a relief for anyone desperate to get started. I hope this will contribute to the B5 forum in some way! When I get some time I will maybe strip the car and take pics of install and post it here weather permitting of course.