Hi guys, great forum with lots of info which I promise I have searched! I have 2009 A3 cabrio and wish to retro fit cruise, MFSW, BT and RNS-E. Can you experts confirm the following? Cruise needs a new lower cowling and switch? BT needs module, antenna, mic and wiring harness? MFSW is straight swop with original wheel (3 spoke airbag)? RNS-E (to be done when funds allow!) is straight swop? (I'm aware of antenna issues which may appear) Now as I dont have cruise or MFSW at the moment I guess I need a new steering ECU? (SCSM?) Does anyone know which part number ECU I need to support cruise and MFSW? I see from searching the main part number is the same but the suffix letters differ, which ones will do the trick? And lastly, might I need to change the slip-ring behind the steering wheel for the mutlifunction to work? What part numbers are good? I know VCDS coding changes are also needed. Thanks in advance guys!