You don't say where you are - so I suppose you're NOT in the US - but for replacing the system, it iS possible, but it WILL be expensive - unless you can salvage the parts from a wreck...
honestly its not worth it.. it will cost you around 3K+ (Audi original system plus Instrument cluster) replacement to enable navigation. Alternatives like HUDs - navdy display is worth investing. I was on same boat as yours but finally, gave up and switched to HUD instead.
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