Behold: the 870hp Mustang RTR Spec 5

The name RTR has always meant something special to Mustang fans. This time, though, Vaughn Gittin Jr.’s team has gone all in with the 2026 Ford Mustang RTR Spec 5. This is not just another tuner car. With more than 870 horsepower and a starting price of $159,999, it offers more power than Ford’s own GTD model for a fraction of the price .

It’s based on the seventh-generation Mustang GT, but it’s been taken apart and rebuilt with a mix of factory know-how and aftermarket engineering. Under the hood is the familiar 5.0-liter Coyote V8, but it’s been boosted with a 3.0-liter Whipple Stage 2 supercharger, an HD race intercooler and a freer-breathing cat-back exhaust. The result is over 870 hp and around 660 lb-ft of torque -  numbers that push this Mustang into proper supercar territory .

A Chassis Built to Handle All That Power

When you’re dealing with that kind of output, you need more than just a bigger engine. RTR has fitted its “Tactical Performance” suspension, which includes 30-way adjustable front coilovers, adjustable rear dampers, height-adjustable springs and tuned sway bars. The idea is to combine cornering precision with daily usability, even with all that extra muscle .

The car’s bodywork has been rethought too. You’ll find composite front and rear fenders with integrated cooling vents, plus composite rocker panels and bumper extensions. Carbon-fiber pieces like the front splitter, rocker extensions and rear wake towers complete the package. Everything here is functional as well as aggressive, which gives the Spec 5 a real motorsport feel .

The stopping power is equally serious. Brembo six-piston front calipers and four-piston rears clamp down on two-piece rotors, while Michelin Pilot Sport 4S tires sit on forged 20-inch Aero 5 Evo wheels — 10.5 inches wide up front and 11 inches at the rear .

Inside the Cabin

Step inside and the changes continue. Recaro sport seats with cool gray bolsters and suede inserts keep you firmly in place. A dash plaque signed by Vaughn Gittin Jr. and a special RTR shift knob give it that custom touch. Otherwise, the Mustang’s cabin layout stays familiar, which makes the Spec 5 feel both exotic and accessible at the same time .

RTR also lets buyers get creative. Extended color palettes and paint-to-sample options are on the menu for those who want a one-of-a-kind Mustang .

Production, Pricing and Availability

RTR plans to build only 50 units of the Spec 5 worldwide. Each one starts with a donor Ford Mustang GT equipped with the 401A Group and Performance Pack. Buyers can choose between a six-speed manual or a 10-speed automatic transmission. The $159,999 price tag includes the donor car, which makes the Spec 5 something of a performance bargain when you look at the horsepower-per-dollar ratio.

FAQs

How much power does the Mustang RTR Spec 5 make?

It produces more than 870 hp and around 660 lb-ft of torque.

What’s special about its suspension?

It has a fully reworked setup with 30-way adjustable front coilovers, adjustable rear dampers, height-adjustable springs and tuned sway bars.

How many units will be produced?

Only 50 Spec 5 models are planned globally.

Which transmissions are available?

Buyers can pick a six-speed manual or a 10-speed automatic.

Does the price include the donor Mustang?

Yes. The $159,999 starting price includes the donor GT with the required performance upgrades.

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