Hellcat Upper Pulley & Hub Kit

The F.A.S. Motorsports Hellcat Upper Pulley & Hub Kit is a precision-engineered performance upgrade designed for the Dodge Hellcat, Redeye, and Demon platforms. The kit replaces the factory supercharger drive pulley with a smaller-diameter billet aluminum upper pulley, which effectively increases the supercharger's overdrive ratio and generates higher boost pressure — translating directly into more horsepower and torque. The hub is machined from 6061 billet aluminum to exacting tolerances, providing a stronger and more rigid mounting solution than the OEM pressed-steel hub, which can flex or fail at extreme boost levels. Together, the smaller pulley and billet hub work in concert to raise boost pressure while ensuring the supercharger drive system remains stable and reliable under the increased load. This kit is engineered to bolt onto the factory supercharger without requiring modification to the nose drive assembly, and it's compatible with the full range of Hellcat platform applications. For best results, a pulley upgrade should always be accompanied by a supporting custom tune to adjust boost targets, ignition timing, and fuel delivery to match the increased boost levels. The FAS Hellcat Upper Pulley & Hub Kit is a foundational upgrade for any Hellcat build seeking more power and is trusted by professional tuners and enthusiasts alike.