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Isn't the opposite true about the sealing at the windscreen side of the hood? Taking that off would try venting bonnet heat into a high pressure zone, which would effectively act as an auxiliary air intake into the bonnet that bypasses the radiator?
Also the diesel civic you guys don't have in America has a tenancy to crack it's exhaust manifold and let out toxic gasses, it might be a failsafe to exhaust them out of the wheel arches like the rest of the air
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