RunCool Hood Louvers are being used on many U.S. Border patrol and police department vehicles. Hot air rises -- and exits -- the overheated engine compartment through RunCool Hood Louvers resulting in longer running vehicles with improvements in power, gas mileage, A/C efficiency and underhood component life, especially where vehicles must sit still with the engine running. The louvers are available in four sizes and in 18 different models/combinations. Police fleet discount are available.