arlen ness filter kit stadium ii oval perfo 600 184Increase Performance and Add Style to the Engine, features a performance filter with a pleated top to take in Air from the Sides and Top of the Filter for Maximum Airflow, Filter, Spacers and Clamps Are All CNC Machined Black Perminum, Performance Air Made , Increased Filter Height Special Designed to Increase Airflow Without Reducing Leg Room, Over 50% More Air Filter Surface Area Than Paper Filhers Found In Factory Oval Air Cleaners, Dyno Testing