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The drag of the cooling system contributes up to about 10% of the overall drag of the vehicle. This is one of the advantages of an electric drivetrain, by the way.
I'm cooling my ~105HP Scion xA with a ~15" x 4" opening. And that is with minimal changes to the overall system. With an efficient exhaust vent, this could be reduced a lot more. Vekke has a car cooled with just a 4" diameter intake.
You should look at the Hucho section on cooling system drag. And several folks here on EM have added exhaust vents in the center of the hood that greatly improves cooling by increasing flow through by lowering drag inside the system.
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