In December, we introduced you to the most powerful factory Cadillac in history: the 2016 Cadillac CTS-V. Featuring a supercharged 6.2L LT4, this sexy sedan will throw down 640 horsepower and 630 ft.-lbs. of torque.

According to the team at Hennessey Performance Engineering (HPE), this is a good starting point.

Hennessey is in the business of taking factory performance to a whole new level (see the Hennessey Venom GT and HPE700 Mustang GT) and is bringing its tuning wizardry to the all-new CTS-V. The result is the HPE1000 Twin-Turbo Cadillac CTS-V, which Hennessey says will pack 1,000 horsepower and a 240 miles-per-hour top speed.

You can get more details on the HPE1000 package, along with some other engine packages, in the company’s press release below. Only 24 of the HPE1000 CTS-Vs will be made for 2016.

SEALY, TX–When the next generation Cadillac CTS-V hits the streets later this year, it will have 640-plus horsepower and a top speed of nearly 200 miles-per-hour. To the team at Hennessey Performance Engineering (HPE), this is a good starting point. The company plans to pick-up where they left off with the last gen CTS-V by producing the world’s fastest 4-door sedan: The Hennessey HPE1000 Twin Turbo CTS-V. “A couple of years ago, the State of Texas gave us the opportunity to test one of our specially tuned CTS-Vs–our VR1200 Twin Turbo coupe. It ran 221 mph (356 km/h) on State Highway 130, near the Circuit of the Americas,” said company founder, John Hennessey. “It was still pulling on when we ran out of road. I believe that our 2016 Twin Turbo CTS-V will have a top speed approaching 240 miles-per-hour (386 km/h).” Hennessey plans to offer a limited run of only 24 units for the 2016 model year. Powered by a strengthened 6.2L V8 engine, the company will remove the factory supercharger and will add twin turbos for increased power and performance. HPE also plans to offer a full compliment of performance upgrades including carbon-ceramic brakes, larger wheels and tires, widebody upgrade allowing for wider tires as well as custom interior upgrades.

“I’ve owned and driven several Cadillac CTS-Vs over the past 5 years,” said John. “I love the practicality and the ease of driving these cars every day. They are also a great platform from which we can create our own special 4-door supercar.”

HPE also plans to offer a wide array of performance upgrades for the 2016 CTS-V. This will include engine packages that deliver 750-800 horsepower from the factory supercharged V8 engine.

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Author: David Fuller

David Fuller is OnAllCylinders' managing editor. During his 20-year career in the auto industry, he has covered a variety of races, shows, and industry events and has authored articles for multiple magazines. He has also partnered with mainstream and trade publications on a wide range of editorial projects. In 2012, he helped establish OnAllCylinders, where he enjoys covering all facets of hot rodding and racing.