K&N Air Filter Ac-1012 K&N Air Filters are engineered to achieve exceptional airflow without compromising critical engine filtration levels. Their effectiveness stems from the innovative filter medium, originally pioneered by K&N in the demanding conditions of desert motocross racing, where dust, sweat, and tears tested its durability and performance. 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 cleaner without modifications Comes pre-oiled and ready to install