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 : 88888 XA5578 CA9683 AF9683 AF1214 PA5578 A35578 46888, Kit Includes: 4x Air Filter, Kit Variations: K57-100138 K57-100461 K57-101044 K57-101343 K57-101723 K57-102103 K57-102483 K57-102863 K57-103243 K57-103623, Part Reference Numbers : 88888 XA5578 CA9683 AF9683 AF1214 PA5578 A35578 46888