This 8 - Rib Belt Drive Conversion Kit is for use with Edelbrock equipped 2013 - 2020 5.0L Mustangs. It enables the use of a wider, 8 - Rib supercharger pulley instead of the standard 6 - Rib design. The 8 - Rib belt drive will allow customers to substantially increase boost levels by installing smaller 8 - Rib supercharger pulleys. The larger belt contact area on the wider pulley will help eliminate belt slip prone to small - pulley, 6 - Rib configurations. For use with 2.625in. to 3.75in. pulleys.