Last week, I told you what it was like traveling around Palm Beach with some of my Collector Car Network colleagues in a rented 2025 Chevrolet Tahoe. Its 5.3-liter V8 got us where we needed to go, but we could have saved a hell of a lot of commuting time in a 2025 Hennessey H600 Tahoe or Suburban.
Technically, Hennessey could have called the upgrade package H625. By adding a new Magnuson supercharger with an intercooler, a cat-back exhaust, and upgrades to the air induction and crankcase ventilation systems, the Texas company boosted the output of the 6.2-liter V8-powered Tahoe and Suburban to 625 horsepower at 5,500 rpm and 633 lb-ft torque at 4,200 rpm (and dyno-tested them to 600 horsepower, as shown in the video below). While those numbers aren’t as high as the Cadillac Escalade-V’s 682 horsepower and 653 lb-ft, they are substantially greater than the stock specs for the Tahoe and Suburban. According to Hennessey, its enhancements boost horsepower by more than 200 and torque by more than a third.
Hennessey also upgrades the hardware responsible for channeling that kind of grunt to the road. It lowers the Tahoe and Suburban 2.5 inches closer to the ground and installs a set of lightweight 24-inch gloss black wheels with Firestone Firehawk Pursuit tires. Up front, the stock brakes are replaced with heavy-duty Brembos with six-piston calipers. Of course, Hennessey makes it clear these aren’t your normal full-size Chevy SUVs by adding a windshield banner, and special exterior and interior badging.
The 2025 Hennessey H600 Tahoe and Suburban will probably be hard to spot on the road because of their supercar levels of power, but don’t worry. There’s a chance you’ll see them on showroom floors because they’re the first GM models available through Hennessey’s authorized Chevrolet dealers in the U.S. But there’s no guarantee: production is limited to 100 units for 2025.
