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Fun fact: Porsche offers this for some of its older generation models.

Yeah, Porsche is the only manufacturer that I know of that actually cares about older cars they've sold.

They even made an amusing ad to that effect: https://www.youtube.com/watch?v=R8-9oIq1hxw

Mazda upgraded 2017-2018 systems with carplay after sale. It cost some money at the dealership but it was a standard procedure they could do