I ask again, visible aero mods or invisible aero mods?
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I ultimately plan to have an automatic shutter that opens preemptively before the fans kick on such as if the engine is under heavy load without a large positive change in RPM, logic being that the only time that happens is on a hill.
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Seal the engine compartment and have movable shutters on the exits, either under the car or in the wheel wells. Doesn't the Prism have a low, oval air intake? A duct that shape that sticks out 3-4" in front, maybe with a bellmouth, that transitions to the rectangle of the radiator itself would be optimal. The exhaust side needs to be 'pulled' by the air moving past it, that might be the back edge of a step.
It's probably all packaged pretty tightly.