aFe Power 11-10131 Magnum FLOW OER Pro DRY S Air Filter Oil-Free Pro DRY S Filter, OE Direct Replacement, 3-Layers Of Progressively Finer Porosity Synthetic "Oil-Free" Media Washable and Reusable Air Filter, Made with 100 percent Polyurethane Top and Base, 15mm Deep Pleats 33 percent Flow increase, Flow (CFM at 1.5" H2O) 203 CFM Hassle-Free Installation, One Pair of Air Filters Manufactured and assembled in the USA; Porsche Boxster/Cayman (981) 13-14 H6-2.7L/3.4L