These 981 RS Vented Carbon fenders are made by the same manufacturer that supplies Porsche Motorsports with a number of 997 and 991 Cup car body parts. The fitment is factory and will require professional autobody installation. Each fender saves 6.5lbs, for a total weight savings of 13lbs for the pair. Fenders fit all 981 Cayman and Boxsters through the GT4/Spyder. Fenders are made to order, please allow 3-4 weeks for delivery.