Hennessey Performance Engineering first teased the Demon 1700 back in 2024. After last year’s engine dyno teaser, the twin-turbo build has now hit the rollers. Full output requires E85 and up to 23 psi of boost from the setup. When the Dodge Challenger SRT Demon 170 came out of hiding, Hennessey decided to take advantage. It would build a more extreme version called the Demon 1700, a figure that would denote its crank horsepower. Now, two years later, it’s finally done, and the results are genuinely impressive. This street-legal monster appears primed to embarrass almost anything with a license plate. Last year, Hennessey showed off engine dyno testing for the fully reworked 7.2-liter HEMI, proving the package wasn’t just marketing hype. Until now, we hadn’t seen the finished product. It has finally been to a dynamometer, and Hennessey is giving us a front-row seat of what it calls the “world’s most powerful” Dodge Demon 170. More: VIN-Matched Dodge Demon Pair Sell For Less Than Some Paid For One Demon 170 In a new video, Chief Powertrain Technical Specialist, Jason Haynes talks through some of the challenges and wins the team had in getting to this milestone. That engine dyno test proved that the powertrain could make 1,700 ponies (1,268 kW). This new chassis dyno test provides us with insight into what owners will get to play with at the contact patch. Specifically, the car makes 1,355 horsepower (1,010 kW) and 1,202 lb-ft (1,630 Nm) of torque at the rear tires. By way of completely unnecessary comparison, the Bugatti Chiron is factory rated at 1,479 hp (1,500 PS / 1,103 kW) and 1,180 lb-ft (1,600 Nm) at the crank, which is a much kinder place to measure things. Accomplishing that requires a bunch of big upgrades, including twin Precision PT6870 turbochargers, new injectors, billet turbo wastegates and blow-off valves, a high-flow stainless exhaust, custom charge piping, a twin-intercooled billet intake system, and a fully integrated turbo oil feed and drain setup. On top of that, drivers will need to fill up with E85 to access all 23 psi of boost available from the turbochargers. It’s worth noting that there are still some unknowns here. Hennessey was very clear from the outset in 2024 that it wanted this Demon 1700 to do the quarter mile in under 8 seconds. In fact, it specifically said the car would target a 7.9-second pass at 175-180 mph (281-289 km/h). There’s no official word on if this completed build can pull that off or not. Knowing Hennessey, if it does hit that mark, you can be sure that we’ll see it on video soon.