The Delbruck Pro-Flo K&N Replacement Oval Filter Element for air cleaners keeps your engine running clean. The Pro-Flo air cleaners are the perfect solution for the low hood clearance problems. Tests prove Pro-Flo air cleaners have low air restriction and good breathing ability for better performance. The original filter element in the Delbruck air cleaner should be replaced with a new element every 3, 000 miles and sooner in dusty areas.