The Ram TRX may have vanished from dealership floors, but Texas tuning legend Hennessey Performance has stepped in to fill the void with something arguably better. Their new Mammoth 700 package transforms the already capable Ram 1500 RHO into a 700hp monster that splits the difference between daily driver and desert-conquering weapon. Based on Ram’s Hurricane twin-turbo inline-six platform, this isn’t just about adding power — it’s about proving that forced induction can match the supercharged V8s that came before it.
Hurricane Force
Hennessey’s approach to the RHO’s 3.0-liter Hurricane engine demonstrates exactly why the company has been extracting absurd horsepower from American iron since 1991. Rather than simply cranking up the boost and calling it a day, they’ve implemented a comprehensive engine management overhaul. Increased boost pressure works in tandem with a custom stainless steel exhaust system and recalibrated engine management software to push output from the factory’s respectable 540 horses to an even 700.
This puts the Mammoth 700 squarely in TRX territory — the departed Ram produced 702hp from its supercharged 6.2-liter Hemi V8. The philosophical difference here runs deeper than cylinder count, though. Where the TRX relied on displacement and a supercharger’s instant response, the Mammoth 700 harnesses twin turbos and modern engine management to deliver comparable power with theoretically better efficiency and torque delivery.
Not Just a Pretty Face
The visual transformation extends well beyond cosmetic touches. Hennessey’s custom front and rear bumpers integrate seamlessly with the RHO’s factory design language while adding genuine capability. The front unit houses a 32-inch LED light bar flanked by 5-inch round lights and corner-mounted 3-inch LEDs — enough illumination to turn night into day on remote trails.
The 3-inch overall lift combined with 37-inch off-road tires mounted on 20-inch Hennessey wheels transforms the truck’s stance from aggressive to downright menacing. Electronic fold-out steps become necessity rather than luxury when you’re climbing into something this tall, and the upgraded 6-piston brake system ensures you can scrub speed as confidently as you can build it.
The attention to detail shows in less obvious places too. Custom skid plates protect vital components during serious off-road use, while the suspension leveling kit maintains proper geometry despite the additional height. Even the all-weather floor mats carry Hennessey branding — small touches that reinforce the transformation from factory truck to bespoke performance machine.
Texas Proving Ground Validation
Every Mammoth 700 undergoes extensive validation at Hennessey’s Sealy, Texas headquarters, including dyno calibration and up to 500 miles of real-world testing. The 3-year/36,000-mile warranty backs up that confidence.
The company’s approach reflects decades of experience turning already-fast vehicles into something extraordinary. From their early days modifying Dodge Vipers to recent hypercar ventures like the Venom F5, Hennessey understands that true performance tuning requires balancing power with reliability and usability.
Spec Sheet
Model: 2025 Ram 1500 RHO Mammoth 700
Engine: Twin-turbocharged 3.0L Hurricane I6
Power: 700hp
Suspension: 3-inch lift with front/rear leveling kit
Wheels: 20-inch Hennessey custom
Tires: 37-inch off-road
Brakes: Optional 6-piston performance kit
Base Vehicle MSRP: ~$72,090
Pricing & Availability
Accepting orders now, the Hennessey’s Mammoth 700 package is priced around $72,090, plus the additional cost of the donor Ram 1500 RHO, which will put the total price well into six figures.
Recap
Hennessey Mammoth 700
The Hennessey Mammoth 700 transforms the Ram 1500 RHO into a 700-horsepower TRX successor by comprehensively upgrading its twin-turbo Hurricane engine and adding serious off-road capability through a 3-inch lift, 37-inch tires, and custom bumpers with integrated lighting.
