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 : 87843 XA5560 CA9838 AF9838 AF1298 PA5560 A35560 42843, Kit Includes: 4x Air Filter, Kit Variations: K57-100199 K57-100545 K57-101123 K57-101411 K57-101791 K57-102171 K57-102551 K57-102931 K57-103311 K57-103691, Part Reference Numbers : 87843 XA5560 CA9838 AF9838 AF1298 PA5560 A35560 42843