If I buy Audi A4 2006 without navigation system, can I than install one?

I am talking about original audi navigationsystem, that is preinstalled option while buying a new car.If I buy Audi A4 2006 without navigation system, can I than install one?Yes you can. Any good car accessory shop will do it for youIf I buy Audi A4 2006 without navigation system, can I than install one?Yes you can with a aftermarket one.