Hood scoop

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A hood scoop (North American English) or bonnet scoop (Commonwealth English), sometimes called bonnet airdam and air dam, is an upraised component on the hood of a motor vehicle that either allows a flow of air to directly enter the engine compartment or appears to do so. It has only one opening and is closed on all other sides. Its main function is to allow a direct flow of air to the engine, hence the need for it to be an upraised component to effectively channel air to the engine compartment.^[1] It may be purely decorative when its closed, or serve to enhance performance in several possible ways.