K&N Air Filter Ac-4096-1 High flow cotton filter media is designed to increase airflow by as much as 50, resulting in an increase of horsepower and torque. K&N Air Filters are tested to ensure increased airflow when compared to OEM paper filters. Engineered to last throughout the life of your motorcycle and backed by K&N Million Mile Limited warranty. Features: High performance replacement air filter elements are made of pleated gauze and designed to be washed and re-used hundreds of times Fits into the original air box without modifications Works with original equipment manufacturer vehicle electronics Come pre-oiled and ready to install