In case you’re not acquainted, the Hoonicorn RTR is a 1965 Ford Mustang notchback with a gargantuan 6.65-liter Roush Yates racing V8 under the hood, fed by a pair of turbochargers and a methanol-injection system. The result is a colossal total of 1,400 horsepower, sent to all four wheels through a six-speed sequential transmission. The car made its debut at the 2014 SEMA Show in Las Vegas, alongside the debut of the film in which it first starred: Gymkhana 7.
Granted, at its debut, the Hoonicorn was naturally aspirated, having just 845 horsepower to its name. The extra power didn’t come until a few years later, as Block was getting ready to film Climbkhana. But both figures are appreciably greater than 647, which is the horsepower the Ford GT left the factory with.