Hennessey’s 850-hp Mustang Dark Horse drops 0-60 mph by a half-second

Hennessey last summer announced a performance upgrade for the 2024 Ford Mustang Dark Horse, which promised to lift output from the stock 500-hp rating to a supercar-worthy 850 hp. Ford hadn’t delivered any examples of the Dark Horse at the time, and as a result Hennessey didn’t have any performance numbers to publish. Fast forward to today and…