The Ultimate Muscle Mutation: Hennessey’s 1,700HP Twin-Turbo Demon 1700
Few cars in the modern era embody brute American performance like the Dodge Challenger SRT Demon 170. Already pushing over 1,000 horsepower from the factory with a factory-tuned supercharged 6.2-liter HEMI V8, the Demon 170 is a drag-strip dominator engineered to demolish the quarter-mile. Yet, in the hands of Hennessey Performance Engineering—a name synonymous with over-the-top horsepower and Texas-sized audacity—the Demon 170 morphs into something beyond comprehension. Enter the Hennessey Demon 1700 Twin Turbo, a beast with 1,725 horsepower and 1,400 lb-ft of torque, delivered through an engineering package that combines massive twin turbochargers, fortified internals, race-grade components, and precision dyno calibration. The result is a hyper-muscle car that blurs the line between street-legal and full-blown race machine, raising the bar not just for Challengers or Hellcats, but for any high-performance vehicle, domestic or foreign. If the stock Demon 170 was a factory-built monster, then the Hennessey Demon 1700 is its fire-breathing, nitroglycerin-injected demigod sibling. This transformation underscores what Hennessey does best: taking already ridiculous platforms and pushing them to realms no sane OEM would dare touch—then backing it with a warranty.
Power Redefined: The 1,700HP Performance Package
At the heart of the Hennessey Demon 1700 upgrade lies a fully re-engineered powertrain designed to deliver astonishing figures—1,725 brake horsepower at 7,000 rpm and a mountainous 1,400 lb-ft of torque at 5,300 rpm. These are not just numbers on paper; they represent the tangible output of a symphony of hardcore components and turbocharged aggression. This is achieved through a bespoke twin-turbo system featuring Precision PT6870 turbos, paired with a high-flow stainless-steel exhaust setup that ensures maximum breathability. High-flow injectors and a custom oil feed and drain setup keep the fuel and oil delivery systems optimized even under full boost. Custom V-band flanges, billet turbo wastegates, and blow-off valves help manage the tremendous pressure while keeping turbo lag virtually non-existent. Chassis dyno tuning and Hennessey’s proprietary ECU calibration refine everything to perfection, creating a car that’s terrifyingly quick yet driveable. This isn't simply a muscle car with big turbos thrown on; it’s a completely recalibrated driving instrument, purpose-built for savagery. This level of engineering ensures not just raw speed, but controlled, repeatable performance—an aspect most tuners only dream of offering with builds this extreme.
Boosted Precision: Turbocharging the Beast
Twin-turbocharging a platform as wild as the Demon 170 requires a precise blend of brute force and refined engineering. Hennessey replaces the factory supercharger system with two massive PT6870 turbochargers—each capable of delivering enormous airflow and boost pressure while maintaining reliability. The turbo system is paired with a Turbosmart boost controller and a four-port solenoid, ensuring razor-sharp control of boost levels across the rpm range. To handle the increased airflow, aluminum and stainless-steel charge tubing is employed, complete with heat shields and thermal barriers to prevent heat soak. The charge system is designed to keep air temperatures cool and consistent under heavy load, while billet-engine mount brackets and dual-sided mount assemblies provide enhanced structural integrity under the hood. This careful calibration of turbo hardware and support systems enables the Demon 1700 to not only make massive power but to do so repeatedly without compromising longevity. Every component of the boost system has been vetted for high-output reliability, showcasing Hennessey’s ability to deliver OEM-level fit and finish with race-ready hardware. The result? Power delivery that feels endless, violent, and beautifully linear.
Forged and Fortified: The Heart of a Monster
In order to withstand the absurd pressures of forced induction north of 30 psi, the 440-cubic inch HEMI V8 is extensively reworked from top to bottom. Hennessey outfits the engine with race-spec internal components and upgrades, including billet connecting rods, forged pistons, and a reinforced crankshaft. It’s not enough to just strap on more boost—you need to make sure the engine can handle the punishment over and over again. This re-forging process gives the Demon 1700 the structural strength to go well beyond its already Herculean stock capabilities. Additionally, Hennessey incorporates upgraded fuel delivery systems featuring PTFE-lined stainless braided hoses, high-flow fittings, and custom adapter manifolds to feed the hungry turbo V8 with all the E85 or high-octane fuel it can drink. Heat management is equally critical, and Hennessey addresses this with a suite of cooling upgrades, from high-flow air induction to improved oil circulation and extensive heat shielding. When viewed in totality, the heart of the Demon 1700 is not just more powerful—it’s also smarter, stronger, and more refined. This engine isn’t just built for dyno brags; it’s constructed to withstand the rigors of real-world use.
Drivetrain Dominance: Transmitting Insanity
To transfer the tidal wave of power to the ground, the Demon 1700 is equipped with an upgraded stage 3 transmission and billet torque converter, capable of handling the immense twist without hesitation. This heavy-duty driveline is mated to a 3.09 ratio rear differential that ensures optimal acceleration, while aggressive driveshaft and axle geometry improvements provide stability under full load launches. Hennessey also upgrades the driveshaft itself, ensuring it’s capable of dealing with the torsional stress that would snap stock components like twigs. A driveshaft safety loop and transmission dust cover are also added for safety and durability during hard launches. Whether it’s straight-line drag racing or rolling acceleration on the highway, the Demon 1700’s drivetrain is engineered to put every last pound-foot of torque to work efficiently and reliably. Unlike other high-horsepower builds that sacrifice durability for peak output, the Hennessey setup guarantees both. It’s a comprehensive overhaul that ensures the entire powertrain can handle extreme abuse while delivering a seamless transfer of power. It’s not just a fast car—it’s a mechanically sound machine that was designed to be flogged, and then do it all over again.
Suspension & Control: Taming the Untamed
With such explosive power on tap, control becomes a top priority. That’s why Hennessey doesn’t stop at the engine and drivetrain—the suspension system is upgraded as well. The Demon 1700 receives a billet control arm set for both front and rear, improving handling rigidity and stability under stress. These enhancements ensure that the chassis remains planted and predictable, even under full boost acceleration or during quick directional changes. OEM-quality engine support tools are also included, showcasing Hennessey’s attention to detail in ensuring every part of the car operates in harmony. The upgraded suspension setup isn’t just for straight-line launches—it also helps in everyday drivability and keeps the car from feeling overly stiff or jittery. Even with 1,700 horsepower at your disposal, the car remains controllable and confidence-inspiring. This is an essential element in making such an outrageous machine usable and even enjoyable on real roads. Hennessey’s upgrades help balance the Demon 1700’s raw muscle with chassis poise, ensuring that it doesn’t just go fast—it also behaves like a well-rounded performance machine.
Soundtrack of the Apocalypse: Roar and Thunder
No muscle car would be complete without an unforgettable exhaust note—and the Demon 1700 delivers a soundtrack worthy of its infernal name. The custom high-flow stainless steel exhaust system allows the engine to breathe freely, while delivering a ferocious, deep growl under acceleration that rises into a banshee-like wail at higher RPMs. Combined with the whoosh of the twin turbos spooling and the hiss of the blow-off valves, the car becomes an auditory experience as much as a performance one. The acoustics are not just for theater—they’re a byproduct of careful exhaust tuning that allows gases to evacuate quickly and efficiently, preventing back pressure and maintaining turbo efficiency. Even idling at a stoplight, the Demon 1700 rumbles with menace, a reminder that this is not your average muscle car. But fire it up on an open track or drag strip, and the full symphony of American turbocharged muscle is unleashed in all its glory. It’s not just noise; it’s a carefully orchestrated mechanical symphony that tells the world this is no ordinary Challenger—it’s a Hennessey-born monster.
Craftsmanship and Warranty: Built for Real-World Driving
One of the most impressive aspects of the Hennessey Demon 1700 package isn’t just the performance—it’s the quality and warranty that come with it. Unlike backyard builds or sketchy one-off tuner specials, Hennessey’s package is fully engineered, tested, and backed by an industry-leading warranty. This means owners can actually drive their 1,700-horsepower Demon without fear of catastrophic failure. Every part, from the billet engine mounts to the custom AC hose and fittings kit, is designed for real-world usability. The car retains enough OEM integration to remain streetable and emissions compliant in many states, while still delivering track-ready brutality. The craftsmanship involved is world-class, with a fit and finish that often surpasses factory quality. This is the Hennessey difference: giving customers supercar-destroying performance wrapped in a package that looks, sounds, and feels like a production vehicle—just one that happens to be faster than nearly anything else on the road. That blend of savagery and sophistication is what elevates the Demon 1700 above the rest and makes it worthy of its price and prestige.
Conclusion: The Pinnacle of Modern American Muscle
The Hennessey Demon 1700 Twin Turbo isn’t just a high-horsepower vehicle—it’s a statement. It’s a showcase of what happens when you combine American muscle heritage with cutting-edge engineering and no-compromise tuning. From its 1,700+ horsepower output and 1,400 lb-ft of torque to its reinforced drivetrain, upgraded suspension, and menacing exhaust note, the Demon 1700 is the kind of machine that rewrites the rules. It delivers performance on par with million-dollar hypercars, all while retaining the unmistakable soul of Detroit muscle. With support from a world-renowned tuner and backed by a warranty, the Hennessey Demon 1700 isn’t just a fantasy garage queen—it’s a real, drivable monster that will terrorize tracks and highways for years to come. For those who crave more power than the factory can ever provide, and who want to own something truly unique in the performance world, there is no substitute. The Hennessey Demon 1700 is not just a car—it’s the final form of the modern muscle car era, an infernal fusion of engineering excellence and American excess.
