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 : 87098 XA91 CA326 CA5034 AF326 AF145 PA91 A50091 42098, Kit Includes: 12x Air Filter, Kit Variations: K57-100038 K57-100429 K57-100725 K57-101012 K57-101199 K57-101579 K57-102339 K57-102719 K57-103099 K57-103479, Part Reference Numbers : 87098 XA91 CA326 CA5034 AF326 AF145 PA91 A50091 42098