The K&N direct replacement air filter is the most popular performance filter they sell.
The K&N performance panel is a direct fit to the original air box and replaces the factory air filter. Fitting the filter takes literally seconds. Performance will be slightly increased by approx 5%. The main benefit is you will never have to buy another one!
To clean the filter you simply wash in warm soap and water and then re-oil using K&N air filter oil.