Hennessey Performance Engineering has been making fast cars for the past 30 years, with one more outrageous than the next. The company is globally recognized for turning late-model, high-performance sports cars, muscle cars, trucks, SUVs, and supercars into the ultimate powerhouses. Its latest project was turning the all-new 2021 RAM 1500 TRX into a 1,000-plus horsepower SUV. The Texas hypercar manufacturer deems it the Hennessey Mammoth 1000 SUV – an exclusive and luxurious seven-seater revealed for the 2021 model year. And may we say, that is certainly an appropriate name for this bold utility vehicle that proves great for dominating the trails with enough room to bring your friends along for the ride and their gear too. 

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Does the world need a three-row SUV that delivers supercar amounts of power? Well, that was rhetorical because Hennessey is building it anyway. This time, though, Hennessey Performance isn’t just throwing a supercharger on the vehicle and calling it a day. It’s actually transforming the RAM TRX pickup truck into a fully capable SUV. Hennessey achieved this by stretching the roofline all the way to the tailgate and adding a third-row folding bench seat as well as a set of captain’s chairs in the second row. Cargo space behind the third row remains substantial and a functional hatch grants access to the rear cargo area, making this truck a five-door SUV. Hennessey Performance only released a single rendering of the SUV (see above), so we do not yet know what the back of the Mammoth SUV looks like with the bodywork changes and we do not get a look inside to see passenger seating, either. 

“I have a big family with five kids and have always enjoyed owning big, powerful SUVs,” said company founder John Hennessey. “In 2012 we converted the first-generation Ford Raptor into our VelociRaptor SUV—I still own one today and love it. Now, we are excited to offer something very similar, but with a lot more horsepower, using the new RAM TRX truck as our base vehicle. Creating this king of SUVs offers our customers the ultimate combination of space, power, and exclusivity.”

Let’s get down to the numbers. From the factory, the 2021 RAM TRX produces 702 horsepower and 650 pound-feet of torque from its supercharged 6.2-liter V8 HEMI engine. Hennessey engineers have upgraded the supercharger system along with new HPE engine calibration. The rebuilt engine sees the TRX’s power output jump 310 horsepower to 1,012 horses while torque is boosted by 319 pound-feet to a remarkable 969 pound-feet. That’s not all, though. Hennessey Performance claims that the complete turnkey SUV has a 0-60 sprint time of 3.2 seconds (compared to the 4.5 sec stock time) and a quarter-mile run of 11.4 seconds. All of this power is made possible by a slew of upgrades like a new intake, high-flow cats, high-flow injectors, and the Mammoth 2.65L supercharger. Scroll down to see the Mammoth 1000 SUV’s complete list of upgrades.