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 : 524491 524507 XA10469 CA11876 AF11876 AF1670 AF1747 PA99001 A28199 A38223 WA10268 WA10317 WA10418, Kit Includes: 11x Air Filter, Kit Variations: K57-100029 K57-100335 K57-100634 K57-100921 K57-101380 K57-102140 K57-102520 K57-102900 K57-103280 K57-103660, Part Reference Numbers : 524491 524507 XA10469 CA11876 AF11876 AF1670 AF1747 PA99001 A28199 A38223 WA10268 WA10317 WA10418