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 : 97233 XA11888 CA12779 TA31515 A31515 WA11057, Kit Includes: 2x Air Filter, Kit Variations: K57-101541 K57-101921 K57-102301 K57-102681 K57-103061 K57-103441 K57-103821 K57-103986 K57-104079 K57-104172, Part Reference Numbers : 97233 XA11888 CA12779 TA31515 A31515 WA11057