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 : 88116 XA4278 CA4309 AF4309 AF882 PA4278 A24278 46116, Kit Includes: 5x Air Filter, Kit Variations: K57-100021 K57-100459 K57-100755 K57-101267 K57-101647 K57-102027 K57-102407 K57-102787 K57-103167 K57-103547, Part Reference Numbers : 88116 XA4278 CA4309 AF4309 AF882 PA4278 A24278 46116