Hi, First of all i own a 2001 Facelift S3 with Climate control. Im gathering all the parts ready for the RNS-e install. At the moment i have the concert single din HU. so first question is - what double din cage do i need? is it the one that holds the symphony HU? or is it the cage from the A4? Is the cage a pain to fit? i hear you need to take everything apart to change it. Once the cage is sorted i need to choose the RNS-E unit, i hear the best one to fit is the one from an A4 as the face plate is a better fit is this true? I also heared loads about this can-bus, what is it and does my car have it? Theres an adepter which you need to wire up the rns-e, any idea where to get this from? if anyone has any good guides to fitting the rns-e with pictures to a 2001 facelift S3, it would be much appriciated.