Racing Air Filters are designed to achieve high, virtually unrestricted air flow to ensure long engine life. The filters consist of four to six sheets of cotton gauze layered between two sheets of aluminum wire mesh. This media is pleated and oiled to enhance its filtering capabilities and overall performance. It provides cleaner, more abundant airflow for improved engine performance. It is completely washable and reusable which perfect for wallet and the environment. It has high-displacement engines and diesels get 8 layers of filter material for optimum power and protection. It provides extra horsepower and throttle response. It directly replace stock filter in a few seconds.