The Mishimoto Honda Civic SI aluminum fan shroud kit will considerably improve engine cooling functions and the overall performance of your vehicle. All Mishimoto fan shrouds are significantly lighter than standard fan shrouds. The longevity of your engine depends on keeping your engine running cool, especially during those unbearably hot days. A Mishimoto fan shroud will notably improve engine cooling performance by delivering more air to the Civic SI aluminum radiator and driving out excess heat. The fan shroud serves another very important purpose: It secures the fan blades, preventing potential damage to other essential engine components. All Mishimoto aluminum fan shrouds include an adhesive protective strip. This adhesive-backed foam strip seals any remaining gap between the fan shroud and radiator so that the fans are only moving air that has passed through the radiator core as opposed to pulling in air from the engine bay, resulting in improved cooling efficiency.