3D print a integrated free valve head/turbo and you can sell two to every customer. 
Accommodate varied displacements with adding or removing vanes similar to Porsche cooling fans.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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