Hello Together I have now brought my third R8 to V8, V10 now the R8 GT Spyder 2012. Unfortunately, the car only has an Audi Concert system, can I convert it to the Navigation Plus system via Plug&Play? My AMAG dealer in Switzerland thinks that the switchboard has to be changed, only work costs of CHF 1’499 are due. The most important thing is to be able to stream music with Bluetooth, someone knows a suitable module? Upgrade steering wheel keys: with material CHF 719.50. Upgrade cruiser: with material CHF 621.30. new key: with material CHF 490.80 If anyone has tips on these points, I would be happy to advise you. Thank you for your commitment and your time. Best regards Muhi