This Mustang Has More Power Than a GTD for Half the Price

The Mustang RTR Spec 5 has a supercharged V-8 making over 870 horsepower, and it starts at $159,999.

2026 Mustang RTR Spec 5

Photo by: RTR Vehicles

Anthony Alaniz

By: Anthony Alaniz

Sep 25, 2025 at 8:00am ET

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RTR Vehicles has been in the aftermarket business for over 15 years, creating numerous upgrades for various Ford performance vehicles. But the company's latest creation—a hopped-up seventh-generation Mustang—might be its wildest yet.

It’s called the Mustang RTR Spec 5, and under the hood is the familiar 5.0-liter Coyote V-8 engine, but RTR also adds a 3.0-liter Whipple Stage 2 Supercharger, an HD Race intercooler, and a cat-back exhaust. The added kit increases output to over 870 horsepower and 660 pound-feet of torque, surpassing the GTD, Ford’s most powerful Mustang ever.

The new RTR Spec 5 features a lowered suspension, which the tuner says doesn’t sacrifice suspension articulation and upgrades to its Tactical Performance setup. The system includes 30-way adjustable front coilovers and rear dampers, height-adjustable springs, and adjustable front and rear sway bars.

The Mustang Spec 5 is RTR’s first vehicle with a complete body kit, which includes composite front and rear fenders with integrated cooling vents, composite rocker panels, and composite front bumper extensions.

Gallery: 2026 Ford Mustang RTR Spec 5

2026 Ford Mustang RTR Spec 5 Front 3/4

2026 Ford Mustang RTR Spec 5 Front 2026 Ford Mustang RTR Spec 5 Rear 3/4

Source: RTR Vehicles

Carbon-fiber upgrades include the front splitter, rocker splitters, rear quarter splitters, and the front and rear wake towers. Other visual enhancements include RTR’s upper grille with LED intakes, its lower grille, a decklid spoiler, aero corners, and personalization options, such as access to the RTR Extended Color Palette or its paint-to-sample options.

Michelin Pilot Sport 4S tires wrap around the 20-inch RTR Aero 5 Evo forged wheels, which measure 10.5 inches in width at the front and 11 inches at the rear. Stopping power comes from six-piston front and four-piston rear Brembo brakes with two-piece front rotors.

Inside, the Spec 5 features Recaro sport seats with cool grey bolsters, black suede inner supports, and ribbed inserts. Each Mustang also features the Electronic Drift Brake, a dash plaque with Vaughn Gittin Jr’s signature, and the RTR Performance shift knob.

2026 Ford Mustang RTR Spec Supercharged 5.0-liter V-8 Engine

Photos by: RTR Vehicles

2026 Ford Mustang RTR Spec 5 Adjustable Suspension

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RTR Vehicles is only making 50 units of its new halo Mustang for 2026. Each one starts at $159,999 and includes the base seventh-generation Mustang GT equipped with the 401A Group and Performance Package.

RTR will offer the Spec 5 with either the six-speed manual or a 10-speed automatic transmission.

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