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Ford Mustang RTR Spec 5

The 2026 Mustang RTR Spec 5 is the ultimate expression of what RTR stands for. It's the result of more than 15 years of pushing design, engineering, and performance further than ever before. This isn't about chasing our peers or repeating what's been done before — the Spec 5 is born straight from our core DNA. Every curve, every component, and every ounce of power is built to embody what it means to be Ready to Rock™. 

This is the most capable and modern, yet aggressive, Mustang RTR® ever offered, created for those who demand the absolute best.

The Mustang RTR Spec 5 has over 870 HP from a 5.0-liter supercharged engine, along with an RTR chassis and a complete aerodynamic package.

Under the hood is a supercharged 5.0L V8 paired with a 3.0L Stage 2 Whipple Supercharger System that produces over 870+ horsepower and 660 lb-ft of torque. An HD Race Intercooler keeps things cool under extreme conditions, while the RTR by BORLA Cat-Back Active Exhaust System — meticulously tuned to perfection by Vaughn Gittin Jr. — delivers a sound that hits just as hard as the power it unleashes. Spec 5 can be optioned with a 6-speed manual or a 10-speed automatic transmission. Either way, you’re in command of a machine that was built to thrill.

The 2026 Spec 5 introduces the next evolution of RTR’s Widebody System. These aren’t bolt-on flares; this is a fully integrated system that redefines what a widebody Mustang should be. Each component has been meticulously engineered to flow seamlessly to complement the Mustang’s body lines. All mounting points are hidden beneath the surface, eliminating exterior hardware from being seen. The result is a precise fit and finish so refined that it looks as if it rolled straight off the assembly line this way.

Under the hood is a supercharged 5.0L V8 paired with a 3.0L Stage 2 Whipple Supercharger System that produces over 870+ horsepower and 660 lb-ft of torque. An HD Race Intercooler keeps things cool under extreme conditions, while the RTR by BORLA Cat-Back Active Exhaust System — meticulously tuned to perfection by Vaughn Gittin Jr. — delivers a sound that hits just as hard as the power it unleashes. Spec 5 can be optioned with a 6-speed manual or a 10-speed automatic transmission. Either way, you’re in command of a machine that was built to thrill.

The 2026 Spec 5 introduces the next evolution of RTR’s Widebody System. These aren’t bolt-on flares; this is a fully integrated system that redefines what a widebody Mustang should be. Each component has been meticulously engineered to flow seamlessly to complement the Mustang’s body lines. All mounting points are hidden beneath the surface, eliminating exterior hardware from being seen. The result is a precise fit and finish so refined that it looks as if it rolled straight off the assembly line this way.

Every Mustang RTR Spec 5 owner has the opportunity to personalize their vehicle with a standard color from the RTR Extended Color Palette, included in the base price, or elevate it with premium and paint-to-sample options for a truly bespoke finish. 

As part of the experience, each owner receives a render of their Spec 5 showcasing their chosen exterior color alongside the three available wheel finishes. For paint-to-sample selections, RTR also provides a custom render and a physical speed shape painted in the selected color for final approval, making the customization process every bit as thrilling as the performance it delivers.

Composite Widebody System Components: front fenders, bumper extensions, rocker panels, rear quarters with tire cooling vents, wheel arches with ducts, and felt liners.

Exposed Carbon Fiber Components: chin splitter, wake tower assemblies (front and rear), rocker splitters, and rear quarter splitters.

Bespoke Fuel Door: engineered with billet arms, a laser-printed nylon bucket, and a vertical over-center motion. It accepts all 50-state nozzles and keeps the OEM push-to-open function intact.

This system isn’t just about looks — it’s about attitude, engineering, and functionality coming together in a way only we can deliver.

Composite Widebody System Components: front fenders, bumper extensions, rocker panels, rear quarters with tire cooling vents, wheel arches with ducts, and felt liners.

Exposed Carbon Fiber Components: chin splitter, wake tower assemblies (front and rear), rocker splitters, and rear quarter splitters.

Bespoke Fuel Door: engineered with billet arms, a laser-printed nylon bucket, and a vertical over-center motion. It accepts all 50-state nozzles and keeps the OEM push-to-open function intact.

This system isn’t just about looks — it’s about attitude, engineering, and functionality coming together in a way only we can deliver.

It is planned to produce only 50 copies, at a price of 159,999 dollars in the USA.

The package includes HD racing intercooler, Borla exhaust system, Tactical Performance suspension, carbon fiber aero body kit, 20-inch wheels, Michelin Pilot Sport 4S tires, Brembo brakes, refined interior with Recaro seats and a choice between six-speed manual and ten-speed automatic transmission.

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