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 : 88677 XA5405 CA9053 AF9053 AF1108 PA5405 A25405 46677, Kit Includes: 4x Air Filter, Kit Variations: K57-100108 K57-100486 K57-101067 K57-101501 K57-101881 K57-102261 K57-102641 K57-103021 K57-103401 K57-103781, Part Reference Numbers : 88677 XA5405 CA9053 AF9053 AF1108 PA5405 A25405 46677