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 : 87731 XA5535 CA9516 AF9516 AF2397 PA5535 TA45535 A45535 42731, Kit Includes: 5x Air Filter, Kit Variations: K57-100620 K57-100621 K57-100771 K57-101253 K57-101633 K57-102013 K57-102393 K57-102773 K57-103153 K57-103533, Part Reference Numbers : 87731 XA5535 CA9516 AF9516 AF2397 PA5535 TA45535 A45535 42731