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 : AF723J WA11085, Kit Includes: 4x Air Filter, Kit Variations: K57-101450 K57-101830 K57-102210 K57-102590 K57-102970 K57-103350 K57-103730 K57-103886 K57-103979 K57-104072, Part Reference Numbers : AF723J WA11085