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 : XA6197 CA11121 AF11121 AF1508 PA6197 A26197 49530, Kit Includes: 12x Air Filter, Kit Variations: K57-100177 K57-100437 K57-100733 K57-101020 K57-101230 K57-101610 K57-102370 K57-102750 K57-103130 K57-103510, Part Reference Numbers : XA6197 CA11121 AF11121 AF1508 PA6197 A26197 49530