I have a 2013 Ford Focus ST with navigation. I would like to retrofit the Sync 2 with Sync 3 and have AppleCarplay as my digital display. I found one source at Infotainment.com, with either navigation or no navigation. Since I have not used or updated my navigation in about three years and use the GPS on my iPhone, I'm not sure I need the navigation. It's an extra $500.00. Anyone out there retrofit their older ST with Apple Carplay? Are you happy with the results and any other source suggestions? Thanks.