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 : 97356 CA12368 AF291J TA41537 A41537 WA11128, Kit Includes: 4x Air Filter, Kit Variations: K57-101523 K57-101903 K57-102283 K57-102663 K57-103043 K57-103423 K57-103803 K57-103926 K57-104019 K57-104112, Part Reference Numbers : 97356 CA12368 AF291J TA41537 A41537 WA11128