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Aerodynamic drag comes in two forms -- Form drag and skin friction. Successful internal ducts are short, with a large cross section.
You could test your proposal by lashing your 'tube' to the outside of the car and placing a [Dwyer] differential manometer inside the openings front and rear and see how much flow you actually get.
You'd want to bell-mouth the front to resist vena contracta.
Do you have a route through the interior that isn't twisted and kinked?
I like the C30 -- lots of plan taper to the cabin.
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