Model History and Information: The Mustang RTR Spec 3 uses a 3.0-liter Ford Performance Whipple supercharger on the Mustang GT's Coyote V8 to deliver 810 horsepower and 615 lb-ft of torque. RTR describes the Spec 3 as the most powerful Mustang RTR it has ever released. The package was tested and validated by RTR founder and two-time Formula Drift champion Vaughn Gittin Jr., and includes staggered RTR wheels, adjustable RTR Tactical Performance suspension, a chin splitter, a duckbill spoiler and an upper grille with LED air intakes.