aFe Power 31-10241 Magnum FLOW OER Pro DRY S Air Filter Oil-Free Pro DRY S Filter, 3-Layers Of Progressively Finer Porosity Synthetic "Oil-Free" Media Made with 100% 55 Shore "A" Polyurethane Frame For Durability, 35% Flow Increase Over Stock 25mm Deep Pleats, Progressive Bump Seal Design requires no sealing grease or gasket Drop-in fitment for hassle-free installation Manufactured and Assembled in the USA