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Our specially designed 1965 - 1981 K & N Air Filter and Chrome Housing actually increases airflow to your Corvette Engine. Here's how: dust and dirt remain on the outer surface of the filter, allowing virtually unrestricted airflow. Rain and mist are atomized as they pass through the K & N oiled fabric element, and excessive oil blow-by from emission control devices will not clog the specially-treated element. Repeated tests on dynamometers reveal consistent increases of 3-5 hp, and their "clean and re-use" feature makes these filters one of the best buys available today. Don't forget the Air Filter Oil & Cleaner in our handy Air Filter Service Kit.