I bought a 2010 Cayenne kind of on a impulse, trading my Mercedes ml350. IMO the Cayenne is a much better car but it doesn't have SAT radio, backup camera, backup sensors, or Nav. Things I have grown to like. I thought I could just buy a factory head unit and pop it in but to do that the dealer gave me an estimate of $6500.00 and thats just too much. Dr Dash board gave me a quote for a Kenwood system for $4000.00 but that sounds a little high to me too. I don't have a Bose system so the only input is AUX in located in the arm rest. It does have blue tooth for the phone. Are there any other options out there? Any pictures of after market systems? thanks in advance.