Upgrade factory Nav/Bose Stereo System???
 

I'm searching for a 2014 2500 SLT or Denali and most of them are coming with NAV installed. Does anyone know whether there are any RCA/AUX inputs/outs so that you could use the factory unit as a head unit and add amps /speakers???? I don't want to have a 2200.00 paperweight if its not usable.