Uni Multi-Stage Competition Air Filters are unsurpassed in airflow, dirt stopping and overall performance. And they produce more horsepower and more torque than any other air filter. Uni's revolutionary two stage air filter is the only filter that comes apart for maximum airflow and ultimate cleaning. Traps dirt and dust in two (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. Fits exactly like the original equipment air filter. Cleans easily with grease-cutting dish washing detergent; just clean oil and reuse. Two-stage air filter comes apart for maximum airflow and ultimate cleaning. Features the Ultra Seal grease groove on the sealing surface. "Flow Matched" filters need no rejetting. Used by Kawasaki, Yamaha and Suzuki off-road teams.