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 : 83343 XA11954 CA11424 AF11424 TA39184 A39184 49343, Kit Includes: 4x Air Filter, Kit Variations: K57-101397 K57-101777 K57-102157 K57-102537 K57-102917 K57-103297 K57-103677 K57-103872 K57-103965 K57-104058, Part Reference Numbers : 83343 XA11954 CA11424 AF11424 TA39184 A39184 49343