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 : 538872 83830 XA10188 XA10327 CA11494 AF11494 AF1576 AF1680 PA8153 TA58153 A58153 49830 WA10400, Kit Includes: 7x Air Filter, Kit Variations: K57-100026 K57-100350 K57-100649 K57-100936 K57-101286 K57-101666 K57-102046 K57-102426 K57-102806 K57-103566, Part Reference Numbers : 538872 83830 XA10188 XA10327 CA11494 AF11494 AF1576 AF1680 PA8153 TA58153 A58153 49830 WA10400