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 : 524489 WA10875, Kit Includes: 4x Air Filter, Kit Variations: K57-101517 K57-101897 K57-102277 K57-102657 K57-103037 K57-103417 K57-103797 K57-103894 K57-103987 K57-104080, Part Reference Numbers : 524489 WA10875