But for those who really need a super SUV, they’ve turned the big Yukon Denali into an 800 horsepower monster. Dropping the kids off at soccer never looked so fun.
Along with it comes a laundry list of racy upgrades including its balanced and blueprinted short block, aggressive crank and camshaft, aluminum pistons, billet steel connecting rods, ported cylinder heads, and lightweight intake valves with heavy-duty springs.
The firm does say there’s an estimated drivetrain loss of about 15 to 20 percent once the big GMC Yukon puts its power to the ground, but even so the engine sure has a lot to give—a massive 805 hp at 6,000 rpm and 827 lb.-ft. of torque at 3,800 rpm.
According to Hennessey, that’s enough to deliver a zero to 60 mph dash in a jaw-dropping 4.1 seconds, and if you keep your foot hard to the floor, the SUV will blitz the quarter mile in 12.2 seconds. For comparison’s sake, the Challenger Hellcat runs the quarter mile in 11.2 ticks of the clock on street tires.
Thinking of challenging one of these at your local drag strip? Perhaps a rethink is in order.