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 : 97158 XA11956 CA12815 TA21768 A21768 WA11216, Kit Includes: 9x Air Filter, Kit Variations: K57-101563 K57-101943 K57-102323 K57-102703 K57-103083 K57-103463 K57-103942 K57-104035 K57-104128 K57-104221 KFL-101902 KFL-102451 KFL-103010 KFL-103051 KFL-103230 KFL-103409, Part Reference Numbers : 97158 XA11956 CA12815 TA21768 A21768 WA11216