In this project, I'm replacing the stock radio in my 2010 Subaru Outback Limited with a custom-built entertainment/navigation system and HUD. I'm using a Raspberry Pi 3b+ running ArchLinux ARM as the core, and writing my own touch UI, Karvy.
Raspberry Pi 3 Model B+
Raspberry Pi 7" Touch Display
Vantec NBA-200U USB External 7.1 Channel Audio Amplifier
For 4-channel audio output
Longruner 5MP RPI Camera with 160° Fisheye Lens