The ROUSH Stage 3 package between 2005-2006 was the top-of-the-line performance modification package and added an Eaton M90 supercharger to the GT’s 4.6L V8 that generated 415 hp and 385 ft-lb of torque. Stage 3 also came with 18-inch forged aluminum wheels, high-performance tires, and 14-inch rotors with four-piston calipers. Numerous “Stage 3” plaques, custom embroidered leather upholstery, and a custom dash cluster helped to identify the modifications under the hood. The Stage 3 package would introduce additional packages in 2007 based on its supercharged performance including the 427R and Blackjack options.