K&N Replacement Air Filters are designed to increase horsepower and acceleration while providing excellent filtration. These filters are custom designed to fit into your existing factory air box. It maximizes performance while adding value with the washable and reusable K&N high flow FilterCharger element. All K&N filters are designed to meet a filtration efficiency of 97-98% while achieving maximum airflow. Special cotton fabric provides a medium for oil suspension and features a molded rubber sealing surface for an airtight fit. They are made of multiple interwoven layers of surgical cotton gauze impregnated with oil for ultimate filtration and airflow. K&N"s pleated accordion design offers increased filtration. They are ideal for extended use in dirty and dusty off-road riding and provide clean carburetion even at high altitude. These filters flow much more air than a stock paper filter by using a special oiled cotton air filter element. It protects your engine with better filtration while providing more air flow and more power. This special design permits very high flow rates, minimum restriction, maximum filtration and a very long filter life.