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BMW is supposed to release one of these (electric-assist turbo) soon actually. In a few years you may be able to buy one from the junkyard and retro-fit the electronics to work with any car.
The only way this would make any economical sense today is if you have very good fabrication skills and a lot of time. Attaching a generator to a junkyard turbo is not too bad if you can make a bracket, you'd need to fit it to your exhaust which is also not too bad, then you'd want to rectify and smooth the generator output and send it through a DC-DC converter that's commercially available. Parts cost could be pretty low but it would take a ton of time.
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