I have a basic understanding of how a traditional turbo works. Exhaust gas spins turbine which powers compressor, which compresses intake air. General problem with turbos is lag. Why couldn't you have a separate air intake that fed directly to the turbo (via a filter obviously), for when off throttle, and use the power of the car moving through the air to keep the turbo spinning? It would also have the benefit of cooling the turbo. If this would work, could you keep the intake open when on throttle to increase boost, or would you lose pressure from the exhaust gas trying to exit via the intake?