K&N Performance Replacement Elements simply drop into the original airbox, replacing the original restrictive paper air filter with a performance, high flow element. No other modifications, parts or accessories are required.The pleated cotton and mesh gauze filters have been designed to improve air flow and horsepower, offering a crisper throttle response and superior performance for improved acceleration and greater driving enjoyment. All this with the highest level of filtration, giving the ultimate protection for the engine. With improved efficiency and less restriction on the airflow, you can also see improved mpg figures, possibly giving important savings on fuel.K&N replacement elements are supplied pre-oiled and ready to use, and can be used over and over again. Simply clean and re-oil the element with the K&N service kits (available to purchase separately) for long lasting performance gains and up to 50,000 miles between air filter cleaning. Not having to buy another air filter