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 : 518217 XA10392 CA11946 AF11946 AF1751 PA8225 A48225 WA10316, Kit Includes: 4x Air Filter, Kit Variations: K57-100297 K57-100618 K57-101194 K57-101225 K57-101605 K57-101985 K57-102365 K57-102745 K57-103125 K57-103505, Part Reference Numbers : 518217 XA10392 CA11946 AF11946 AF1751 PA8225 A48225 WA10316