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 : 83920 87859 XA5546 CA10236 AF10236 AF1321 AF1655 A35546 42859 49920, Kit Includes: 12x Air Filter, Kit Variations: K57-100205 K57-100558 K57-100849 K57-101136 K57-101288 K57-101668 K57-102428 K57-102808 K57-103188 K57-103568, Part Reference Numbers : 83920 87859 XA5546 CA10236 AF10236 AF1321 AF1655 A35546 42859 49920