I was thinking of replacing the radio to a double din. Since it will have Navi why would I want a second screen?
My Question is what information is on the non navi screens? What if I just put a non navi dash in? Gains Losses? Thoughts?

 

when I was trying to get discs out of my NAV 6 cd player, it took the cockpit enviro controls off line and a couple others I forgot since then.
There are a lot more systems and downstream controls than I know of that might be effected if you take out the radio/screen combo. Others have a better idea of what those are, i forgot from years ago on my 04 TL