I have a factory optioned "Apps" car, and I don't need the snap in adapter for any of the app functionality to work. Not sure what is needed to retro, but the adapter isn't a requirement for it to function.
Current: '13 E92 M3 Euro Delivery 9/4
Wife's: E39 M5, E36 M3, E30 M3
Gone: E86 M Coupe