Hi Guy's, I'm a Car Audio specialist (42 years) & upgrade the Audio systems in Audi's all the time, I'm also an Audi A4 3.0 Tdi (B7) Quattro S-Line owner in Kent
so I'm deffo not touting for any business, particularly as you guys are far away from me anyway! But I would gladly give some advice if needed? Particularly if you are going to attemp to do this yourself etc! Not only on what I would recommend you do or don't look at buying (Budget wise) but also and more importantly the many additional things to know about Your Audi A4. I.e. Once the original Concert, Chorus or Symphony single or double din Audio Head unit is removed there is quite allot to add or compensate for to add an aftermarket system to all Audi vehicles and not just a simple matter of buying a new head unit and a correct single or double din fascia panel! For example, all Audi vehicles are either half amplified or fully amped (Bose) also phantom (amplified AM/FM antenna) Also the original audio unit will have no acc - ignition feed present in either the earlier A4 - B6 (iso connectors) or the Facelift B7 onward (Fakra -Quadlock 40 way connector) Double din units, the ignition on for all Audi's is achieved via the can bus data pair the goes to the head unit and there is no ignition 12v feed as such that is required to switch on an aftermarket replacement head unit, you can cheat by running a seperate ignition feed to the new audio head unit via the fuse box but this is not a good way of doing it! You will need at least a slim key Can Bus ignition interface at around £45 or if your vehicle has multi function steering wheel commands you will need a Can Bus Steering command interface unit on either ISO or Fakra depending etc These cost about £70.00 but worth getting! You will also need either a full Bose Amplifier retention patch harness or a Half amped patch (otherwise you won't have any rear speaker audio). This would apply to the A3, A4, TT old A6 etc, A4 convertible can be different again even post 2006 to the standard A4 2006 B7 as they follow the audio platform of the 2005 A4 (B6) Confused? Yeah Audi's are real good fun & even doing this daily even I get confused & have to double check all on the vehicle before I quote for any installation of audio change or adding a Parrot Mki bluetooth hf unit! Everyone says Audi are same as VW... "Oh No they deffo are NOT! They are quite unique between the family of VAG & Skoda, Seat etc that are indeed same as VW. Audi however keep us thinking.
If you are attemping to install a quality brand of aftermarket head unit such as Kenwood, Pioneer Sony, Alpine or even JVC I'll gladly answer any questions you may have and fire away I'm all ears and will help or advise if I can.
If however you have bought one of those awful eBuy Chinese Xtron or similar £199.00 rubbish Android retro (bootfair quality units) send it back now and demand a refund or take it to a field & shoot it. I'm not interested as you can't make a silk purse out of a pigs ear etc * _ *
