Hi, I have just bought an A6 Avant 2.7 Tdi S-line Lemans (2008) and I am looking to retro fit bluetooth. It has MMI Basic and a single slot CD and MFSW. I have been trawling this forum trying to establish which unit to buy and I think i would prefer OEM. Can anyone advise me what I need to buy to fit this to the car. I would be happy to try fitting it myself if there is a guide somewhere on here maybe? or if anyone can recommend someone to fit it (Glasgow area). Also can I buy a multichanger and and replace the single slot Cd directly or would I need anything else? Any advice appreciated. Cheers.