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 : 87351 XA5539 CA5777 AF5777 AF1233 PA5539 AF5539 42351, Kit Includes: 8x Air Filter, Kit Variations: K57-100281 K57-100583 K57-100872 K57-101159 K57-101220 K57-101600 K57-101980 K57-102360 K57-103120 K57-103500, Part Reference Numbers : 87351 XA5539 CA5777 AF5777 AF1233 PA5539 AF5539 42351