Keeps damaging particles from entering the engine and causing increased engine wear, Improves engine response time Protects the operational performance of your engine, Reduces ecological footprint through fuel economy, Boosts fuel economy by 6% to 11%, 98% Efficiency Against Rocks And Other Debris on the Road, Part Reference Numbers : 97058 97378 XA10638 XA10639 CA12268 AF338J AF384J TA21778 A21778 A21835 WA10866 WA11694, Kit Includes: 12x Air Filter, Kit Variations: K57-101557 K57-101937 K57-102697 K57-103077 K57-103457 K57-103837 K57-103887 K57-103980 K57-104073 K57-104166, Part Reference Numbers : 97058 97378 XA10638 XA10639 CA12268 AF338J AF384J TA21778 A21778 A21835 WA10866 WA11694