Sealy, Texas-When the next generation Cadillac CTS-V hits the streets later this year, it will have 640+ hp and a top speed of nearly 200 mph.  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 mph (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 hp from the factory supercharged V8 engine. Source: Hennessey