2 ins and outs give you more options you can link them and get it to the mmi
so you could do it with your wiring , but your right about the tuner unless you have it on they wont be able to see it, you can use the nav of course but you cant listen to music or radio, so you need a couple of wireless headphones. as long as they dont want the tv on you can listen to music at the same time.
what are these units you have found, do you have a link to them?
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A8 4.2TDI - Ice Silver, Comfort heated/cooled/massage Seats, Alcantara, Extended Leather pack, Ambient light pack, Solar roof, Night Vision, Lane change assist, Audi presense, Audi BrakeGuard, ACC Cruise, Blinds, Quad Air, AMI, Online services, Parking with rear Camera, Aluminium brushed inlays, Adaptive Zenons, High beam assist, Bose Sound, and more
Gone but not forgotten: A8 D3 2005- AMI HDD, Audible Parking, TV, NAV, Bluetooth, Hybrid TV, Aftermarket headrest monitors, Rosstech VCDS / Vagcom
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