mygig rer navigation gps

I am selling both Low Speed units and I know they work in my previous 11 Challenger as well as a brand new 14 Challenger.. 730N RER With Nav 430N RBZ No Nav, - Unit is brand new, still has plastic on it. Just got it with the car Friday. This unit is actually really nice, Bluetooth...

All, need help deciding on an in-dash system for my 2010 challenger R/T. I believe that I have 6 boston acoustic speakers and I don't want to lose this capability. I also have uconnect radio and have the serius radio option, but I don't need the serius. I am considering the mygig RER, but...