Question? I own a 2005 Prius, and it has the standard screen for climate/audio/information (4 button system). I noticed that Toyota does NOT do any after sales upgrades for a Navigation system. Called them today and the parts department verified this can't be done (seems foolish since Toyota could make some money off these options...). If I can find a OEM navigation system to install in the Prius, can it be slapped in? Or is there some wiring that would be mising from the original manufacturing of the vehicle? I know I would need the navigation system, voice recognition box and possibly the steering wheel button. If I found these items, can it be done? Thanks for any input!