The Edelbrock Competition Supercharger 8 rib, 3.75 Pulley part 15831 is the perfect upgrade for your Edelbrock supercharger kit when more boost is wanted. Compatible with 2016 Camaro Supercharger kits (use 8 Rib Pulleys standard) and 2011 Mustang Supercharger kits equipped with optional 8 - Rib conversion kit 15879.