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To go further with some quick numbers.
The s63TU running 30PSI consumes 370LPS(one cylinder head) of air at WOT.. A compressor wheel that has a 2 inch inlet, flow goes supersonic at 1129 ft/sec, our engine at 370LPS has the flow velocity at a 2in diameter of 598 ft/sec, almost half of what sonic is. Very clear that volumetric flow is not a concern. The frictional boundary layer associated with getting that flow is where our benefits are, but by introducing the nozzle you are able to optimize the flow as much as possible by the time it hits the compressor wheel. Still far from sonic but the slower the flow the better, but design limitations force you to make things a certain way, as this situation shows.
-R
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