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I know that's what you meant by ram air, though much of the gains are from the cooler air temperature. The OEM location will give some ram air effect, it should be in a high pressure zone ahead of the wheel arch bulge. The cowl or front of the car are probably higher pressure areas, but obviously difficult to duct to! An effective ram air intake doesn't have to have a big honkin' scoop to be effective, and the drag from a large scoop may offset any HP gain. Their effectivness is difficult to judge without wind tunnel testing, CFD, or lots of trial an error.
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