I'll be starting a build in a couple days in a car nearly specifically for SCCA Solo Autocross.
It has a standalone aftermarket ECU made by an Australian company called microtech.
My aim is to put up digital gauges, so it would be pretty nifty if i could manipulate those gauges or even change settings on the fly from a gauge screen.
I may pick up some Cuzco Zero2E coilover suspension struts, which are remotely electronically adjustable. If I could make all of these types of adjustments from the seat of the car through a CarPc, that would be really interesting.
It looks like embedded could work quite well in these aims.