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 : 97353 TA21775 A21775 WA11233, Kit Includes: 4x Air Filter, Kit Variations: K57-101528 K57-101908 K57-102288 K57-102668 K57-103048 K57-103428 K57-103808 K57-103932 K57-104025 K57-104118, Part Reference Numbers : 97353 XA12004 CA12879 AFJ102 TA21775 A21775 WA11233