OK. So I just bought (01/2019) a 2008 Touareg with DVD based navigation system with the Dynoaudio upgraded audio system w/ 6 Disc changer. No bluetooth, or any other option than the phone jack Aux input in the center console. So I've done a few hours of research lookin for an updated nav system with bluetooth capabilities. That's now the problem. The issue I have is... why can't I find a unit that utilizies the existing GPS antenna, back-up camera and aux input?? I hate thinking that I have to 'hard wire' a new unit and also have to run wiring for a new GPS antenna and back-up camera when it already is wired for them. Most of thes units, either domestic or foreign, avoid answering questions about the connectivity of the unit to the specific vehicle. Now there's some Chinese brands like Seicane and Smartauto24 that have some interesting units that might work, but most of the reviews on YouTube are from the companies that build them, so thats not useful!! I'm concerned about the steering wheel controls, No loss of existing speaker setup (11) and compatability with the center instrument display which shows nav info or audio info. So the basic question is....how to upgrade your unit without cutting wires and using the existing hardware!! Who's got an answer??