Oppo... I've had an idea.

So. I was looking through the Mercedes clever little turbo split and hit a strange idea....

Take out the compressor all together, run the turbine as a generator with electric motors at each of the front wheels. Could run batteries in the footwells. Not sure how much energy you'd be able to get out of the system without causing back-pressure issues, however I want to say it'd see similar energy gains as a traditional turbo, just in different form.