radio

I need help. So I have a 2008 without navigation and I am wondering if i can just take out the screen and all the other stuff and replace it all with another oem screen & headunit (i don’t know the exact term) that has navigation or would i be better off getting a 3rd party replacement screen with bluetooth already? I don’t know what the best options are and I do not want to spend 700 bucks on a tesla screen