Kinda reminds me of this, kinda lol
Its an ODB11, not sure if they have them for all cars but the one I had worked for VW/Audi.
You could purchase 'coins' on your phone and use them to 'buy' mods.
You could change up the way your taillights blinked when using the blinker, change the background of your display and such.
I would change up my lights from time to time and used mine to turn off that fake engine sound VW does. Also turned off my 'doors open ding' and seat belt warning ding and light.