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 : 87972 XA5457 CA9409 AF9409 AF1211 PA5457 A45457 42972, Kit Includes: 10x Air Filter, Kit Variations: K57-100013 K57-100571 K57-100860 K57-101147 K57-101824 K57-102204 K57-102584 K57-102964 K57-103344 K57-103724, Part Reference Numbers : 87972 XA5457 CA9409 AF9409 AF1211 PA5457 A45457 42972