You don’t get more Yanke Doodle, gun touting, rootin’ tootin’, gas station food eatin’ than Texas. Yes, that Texas, a southern State in the USA where you can buy a packet of Lays and an Ozzie 9mm in the same store. In Texas, firepower isn’t limited to convenience stores, and if you require unlimited firepower then you need to call Hennessey.

The latest Hennessey creation is as extreme as any other Hennessey before it. The Mustang Dark Horse showcases the company’s latest quest for extreme performance upgrades. Hennessey’s engineers have transformed the performance of America’s iconic pony car with a 70 percent power upgrade, achieving 850 horsepower, alongside boosted torque of 650 lb-ft.

The factory spec Mustang Dark Horse has 500 bhp and can hit 60 mph from stationary in 3.7 seconds, in 10-speed auto form. Hennessey’s uprated H850 Mustang hits the same speed in just 3.2 seconds. The standard Dark Horse completes the ¼ mile in 12 seconds at 118.4 mph. Hennessey betters this benchmark too, with the H850 auto achieving the same distance in 10.9 seconds at 133 mph.

The stock Dark Horse has a naturally aspirated Gen-4 Coyote 5.0-liter V8, to which Hennessey adds a high-performance supercharger, high-flow air induction system, upgraded fuel injectors and fuel pump, plus Hennessey’s rigorously developed engine management system.