Check out Edelbrock’s Stage II Supercharger kit for your 2011-13 Mustang. We have achieved smooth and responsive horsepower gains of close to 200 to the rear wheels. With stock exhaust and a Edelbrock’s custom tune you can expect to get 647hp at the crank. The Stage II kits adds a smaller supercharger pulley and a competition air inlet to create more boost pressure. This 2013 Mustang with full exhaust and a 4.10 gear was able to run the equivalent of a high 10-second quarter mile.