RTR’s Spec 5 Mustang Packs 870 HP and Makes the GTD Look Like a Bad Deal

It is 2026 and RTR Vehicles just dropped a Mustang so ludicrous that Ford’s own GTD might need a stiff drink. Meet the 2026 Mustang RTR Spec 5—a Whipple-supercharged, carbon-clad monster that cranks out over 870 horsepower and costs less than half of the $325,000 halo Mustang. If that doesn’t make you spit out your coffee, nothing will.

RTR has been tweaking Mustangs since forever, but the Spec 5 feels like their mic drop. Only 50 will ever be built, and each one is a rolling middle finger to the idea that you need supercar money to get supercar theatrics. Starting at $159,999, this thing is basically a theft—but the good kind.

Let’s pop the hood, shall we? Nestled inside is a 5.0-liter Coyote V8 that’s been force-fed a 3.0-liter Whipple Stage 2 supercharger. With an HD race intercooler and a freer-breathing exhaust, it churns out a hair-raising 870+ horsepower and 660 pound-feet of torque. For context, Ford’s own GTD makes “over 800” ponies and costs as much as a small house in the suburbs. The RTR doesn’t just beat it on paper—it suplexes it. And the best part? You can row your own gears with a six-speed manual or let the 10-speed auto handle business. Traction is merely a suggestion, though the Michelin Pilot Sport 4S tires and forged 20-inch Aero 5 Evo wheels try their best to keep you pointed in the right direction.

To keep all that fury from shaking your fillings loose, RTR threw in a 30-way adjustable coilover suspension, beefy dampers, and sway bars. The result? A car that’s planted enough to carve corners but won’t punish your spine on the drive home. It’s comfy, yet totally bonkers—like a grizzly bear in a tuxedo.

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