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The oil cooler opening is small compared the the rest of the front spoiler which is keeping air out from under the car. The oil cooler is also not an open hole and will have some resistance to air flowing through it, as the open space in the cooler is smaller than the opening. The net effect, IMO, is that a solid front spoiler would be more effective than one with an exposed oil cooler, but they are both so much better than no spoiler at all that the difference might not be that significant.
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Wider is Better
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