The K&N 57S Performance Airbox replaces the original airbox with a fully enclosed, purpose-designed, Generation II rotary moulded airbox and K&N high flow filter. The enclosed airbox means cool air is retained and fed to the engine without external heat sources affecting inlet temperatures. The custom-engineered airbox has been designed to increase, smooth, and straighten airflow - allowing maximum cool air for increased power. By reducing both the air filter and air box restriction, these systems provide up to three times the power gains available with a K&N replacement air filter.The airbox features a removable lid for easy servicing, and the filter is completely washable and reusable, meaning you never have to buy another filter again.Guaranteed horsepower - aerodynamically designed to increase airflow and reduce turbulence, providing up to three times the power gains from a K&N replacement air filterSpecifically designed to use original airbox mounting points so no additional hardw