Sure, currently it's not easy to develop such a system because large capacity aftermarket turbochargers exist at relatively low cost, but there's nothing stopping it from being financially feasible! Essentially all that needs to be done is rethink the way the turbine is sized compared to the compressor, along with housings, and attach a gearbox to the turbo shaft and then couple that to the engine via a belt or chain. Maybe in the future automakers will turn to this sort of idea to improve volumetric efficiency, and we'll have plenty of standalone power turbines sitting in cars for this purpose
@above post: I believe meant "you can definitely". With a turbo the only "extra" energy you can get is from the velocity of the exhaust gas, except a single stage turbine doesn't collect very much of this impulse. The efficiency advantage of a turbo comes at higher boost levels and higher altitude, where the difference between cylinder pressure at exhaust valve opening and atmospheric is greater. In addition using a blow off valve is probably worse than the bypass valves built into superchargers as far as efficiency is concerned. I have to say, madfast's turbo complaints got me thinking about the actual advantage of a turbo, and they are slightly more efficiency under some conditions, better for high boost, and easy to create peaky power down low.