If there's ever been a vehicle built to purpose, it's the original Hummer – a singularly focused military vehicle built for taking soldiers off-road. Mil-Spec knows that better than most, but its latest modified H1 isn't designed to crawl over rocks. It's been built for the race track.

Mil-Spec Automotive, as you may recall, is the Midwestern company (with operations in Detroit and Wichita, Kansas) dedicated to upgrading Humvees for civilian use, hitting the scene with its H1-based Launch Edition earlier this summer. During the process of developing its enhanced powertrain, Mil-Spec found its modified engine was producing a lot more than expected.

So when development was completed, the team turned its test mule into the track beast you see here. It packs a 6.6-liter GM Duramax V8 turbodiesel engine, but instead of the 300 horsepower and 520 lb-ft of torque you might find in, say, a Chevy Silverado HD, or even the 500 hp and 1,000 lb-ft in the Mil-Spec Launch Edition, this one kicks out a downright insane 800 hp and 1,500 lb-ft of torque. All that muscle is transmitted to the tarmac via a stage-five Allison 1000 transmission. And as you might have guessed, the modifications didn't stop there.

Mil-Spec's "skunk works" team also stiffened and dropped the suspension by over seven inches and fitted Pirelli P Zero tires and six-piston vented and slotted Wilwood brakes – along with Sparco racing seats, a Momo steering wheel, a powertrain kill-switch, and an air-locking differential "for some 'tail-happy' shenanigans."

The heavily modified 1987 AM General HMMWV ("Humvee" for short) ran an 8.71-second run down a 1/8-mile drag strip, and embarrassed a few sports cars at the M1 Concourse in Pontiac, Michigan, during Roadkill Nights at the Woodward Dream Cruise. For better or worse, though, this project remains a strict one-off, with no plans to build any to similar specifications for customers.