Uni NU-4068ST Multi-Stage Competition Air Filters Unsurpassed in airflow, dirt stopping and overall performance Fits in stock air box exactly like OEM filter Traps dirt and dust in 2 layers of foam The large pore, pre-filter captures the bigger particles The small pore, inner filter prevents any engine-wrecking grit from reaching the cylinder Features the Ultra Seal grease groove on the sealing surface Made in the U.S.A