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 : 88440 XA5090 CA8038 AF8038 AF513 PA5090 A45090 46440, Kit Includes: 9x Air Filter, Kit Variations: K57-100149 K57-100541 K57-100832 K57-101119 K57-101348 K57-101728 K57-102108 K57-102488 K57-102868 K57-103248, Part Reference Numbers : 88440 XA5090 CA8038 AF8038 AF513 PA5090 A45090 46440