If you run a roof spoiler you won't have that low pressure zone. If not, the fan and carbs will pull what it needs. I don't think it will create a ram air effect, just a larger area for air to enter the engine bay (kind of like stand off's). I think with the right shape using a grill with a rain tray would look great. With the grill and tray removable for when you want to show off what's under the decklid.
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