North East Forum Moderator
The only difference between AUX and the iPod kit is that the iPod kit support text display and allows you to change track via the Steering Wheel Controls/Stereo. The AUX doesn't allow any of that; everything is controlled via the device itself allowing you to change only the volume.
There are aftermarket kits available, such as the Xcarlink, which are able to offer you iPod support and keep your CD Changer, but its all a bit of a nightmare and never works seamlessly. My vote would be to remove the CD Changer and get the AMI.. working with your MK2 RNS-E, it'll work a dream.