Hennessey’s marketing team has clearly ramped up their game to match their engineering department, as the company is hot off the debut of their would-be world-beater, the Venom F5, at August’s Monterey Car Week. Now, they’ve posted a video to YouTube demonstrating the insane horsepower they’ve cranked out of a modified GMC Yukon Denali.
The Texas-based tuners have long made their name modifying existing vehicles, and despite the debut of the fully bespoke Venom F5, it seems clear they intend to keep bolting on impressive upgrade packages to production cars, trucks, and SUVs alike. The new clip features a GMC Yukon Denali equipped with the HPE650 Supercharged Upgrade, which ups engine output to a claimed 650 horsepower at 5,500 RPM and 658 lb-ft of torque 4,200 RPM.
As with many manufacturers, Hennessey’s power figures are based on output at the crank, not at the wheels—the dyno chart posted at the end of the video shows peaks of just under 542 horsepower and just over 567 lb-ft at the wheels (reached at 6,030 and 4,030 RPM, respectively). With most engines losing around 15-20% of their output between the crank and the wheels, those figures line up right in the sweet spot for the HPE650-equipped Yukon Denali.
Hennessey achieves those stats thanks to an upgraded 2.9-liter supercharger that’s larger than many four-cylinder commuter cars’ entire engine displacement. High-flow intercooling and a stainless catback exhaust system round out the powertrain modifications, while a 22-inch wheelset and 15-inch Brembo front brakes also fit into the mix.
The whole package allows Hennessey to claim their Yukon Denali HPE650 will be able to sprint to 60 miles per hour in only 4.5 seconds, on the way to a trap time of 12.9 seconds at 106 miles per hour. Not bad for a massive eight-seater SUV that leaves the factory tipping the scales at just under 5,500 pounds.
Denali owners who feel inclined to take on the Hennessey package can also buy with confidence, as Hennessey includes a 3-year/36,000-mile warranty on their work. And incredibly, this isn’t even the peak iteration of Hennessey’s Yukon Denali offerings, as they also list an HPE800 upgrade package that includes a comprehensively built and stroked engine running increased boost that produces a claimed 805 horses and 812 lb-ft.