2026 Ford Mustang RTR Spec 5 with 870-HP Supercharged V8 and Widebody Kit

RTR Vehicles has transformed the 2026 Ford Mustang into the Spec 5, pairing a composite widebody kit with a supercharged 5.0-liter V8 that produces 870 horsepower. The build also features 30-way-adjustable front coilovers, adjustable sway bars, 20-inch forged wheels wrapped in Michelin Pilot Sport 4 S tires, and a co-developed Borla exhaust system.