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 : 87740 XA5387 CA9441 AF9441 AF1107 PA5387 A45387 42740, Kit Includes: 12x Air Filter, Kit Variations: K57-100256 K57-100580 K57-100869 K57-101156 K57-101261 K57-101641 K57-102401 K57-102781 K57-103161 K57-103541, Part Reference Numbers : 87740 XA5387 CA9441 AF9441 AF1107 PA5387 A45387 42740