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 : XA5517 CA9525 AF9525 AF1232 PA5517 A35517 42164, Kit Includes: 11x Air Filter, Kit Variations: K57-100319 K57-100579 K57-100868 K57-101155 K57-101293 K57-102053 K57-102433 K57-102813 K57-103193 K57-103573, Part Reference Numbers : XA5517 CA9525 AF9525 AF1232 PA5517 A35517 42164