Uni Filter Multi Stage Competition Air Filter KTM / Husqvarna / Gas Gas 125cc-450cc Uni Filter Multi Stage Competition Air Filters utilize a revolutionary 2-layer foam design to provide unsurpassed airflow and dirt stopping capabilities. Features: Traps dirt and dust through 2 purpose-built layers of foam Large pore layer is a pre-filter that captures the bigger particles Small pore layer sits underneath to prevent engine-wrecking grit from reaching the cylinder