Hi, I have an A3 2006. It has the single din OEM cd player in it. No MFSW or Bluetooth fitted. I will eventually purchase the RNS-E but after reading up if I want bluetooth to work I need to purchase a bluetooth kit for the car? It has a cradle installed but its does not fit my iphone4. I dont really care for being able to use bluetooth to call people etc it is mainly for playing back music in my car from my phone. What would be the cheapest and easiest option? Installing Bluetooth kit, installing aux, installing different cradle etc? bearing in mind they will need to work when the RNS-E unit when I purchase it and yes I will be doing the single to double din conversion so it fits. Thanks you helpful people!