Ford Mustang Handed Tyre-Shredding 650 kW by RTR
Posted September 30, 2025
By: Cale Nuttall
RTR has whipped the wraps off its most powerful Mustang-based project yet, the 2026 Mustang RTR Spec 5.
RTR has unveiled the Spec 5, the most powerful Mustang-based model this US tuning company has ever created. Only 50 examples will be built for 2026, each priced from $159 999, which, at the current Rand-Dollar exchange rate, translates to R2.7 million.
Based on the S650-generation Mustang GT Fastback, the Spec 5 employs the Blue Oval brand’s familiar Coyote powertrain. However, for the Spec 5, RTR has fitted the 5.0-litre naturally aspirated V8 with a 3.0-litre Stage 2 Whipple supercharger; lifting the peak power and torque outputs to a whopping 650 kW and 895 N.m. Two transmission options are available: 10-speed automatic and, for those who prefer rowing cogs themselves, a six-speed manual ‘box. The V8 soundtrack is provided by a Borla cat-back active exhaust system.
In addition to these revisions, RTR has also replaced the suspension setup; ditching the standard arrangement for its own Tactical Performance Suspension, which features 30-way adjustable coilovers, unique sway bars, and specially tuned dampers. Two-piece Brembo brake rotors provide stopping power and are sited behind 20-inch RTR Aero 5 Evo forged alloy wheels, wrapped in Michelin Pilot Sport 4S tyres.
The Spec 5 features RTR’s first full widebody kit, fashioned from carbon fibre. The Spec 5’s bodywork features new bonnet vents, a more prominent front splitter, composite front wheel arches with integrated air ducts, carbon-fibre side skirts, and a carbon-fibre ‘ducktail’ rear spoiler. The package further includes after bumper extensions.
Inside, each example is fitted with a numbered (out of 50) dash plaque with FormulaDrift champion Vaughn Gittin Jr.’s signature. Additional RTR interior items include a performance gear knob, leather Recaro sports seats, and RTR floor mats.
