Originally Posted by InfiniteVTec

like the gt series turbo, with dual ball bearings?

If I had the money, I'd design a turbo that gives the benefits of a small and a large turbo, a turbo that's like 2 in one, something that would spool 2 compressor blades, the smaller blade spins faster than the larger blade, using a stepper setup similar to a centrifugal supercharger, 2 synchronized housings two outlets...

basically the smaller blade spins freely, and at a certain RPM or when the small blade loses efficiency, it releases that blade, captures the larger blade and spins that blade using the existing inertia for smooth flow, similar to clutch/torque converter technology... that's just some rough idea for a design. 2 blades and 2 housings.