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Message: <blockquote data-quote="ReplicaR" data-source="post: 902725" data-attributes="member: 9209"><p>Heat extractor hood does not vent anything. It extracts the used up hot air out of the engine bay. Once the air has gone through the radiator, it's trapped in the engine bay until it can build up enough pressure to exit either through the bottom of, ending up under the car, generating more lift in the process, or through gaps around the hood panel. Heat extractor takes that air, and helps it exit through the hood. This has a few positive effects, one being that you increase downforce by reducing the amount of air that goes under the car, and increasing the amount of air that goes over the car. Another one is that since the air is no longer trapped under the hood to a certain extent, it's no longer working against the air going through the radiator, and helps with cooling.</p></blockquote><p></p>