I'm going to be having a go at installing on of these in my 2007 S3, and I was wondering if anybody has actually fitted one of them at all? Was looking for hints, tips and possible shortfalls to look out for. Is there any wiring that needs altering? What coding needs to be done? Any help is greatly appreciated. It will be installed to a RNS-E with media button. Thanks so much, Daz.