There’s no doubt that the name Hennessey resonates with performance as the American tuner has created some of the most powerful upgrade programs ever offered on production cars. 
Their latest creation, which they call the V1000, is based on the Cadillac CTS V Coupe and apart from including a series of aggressively designed body parts, it is also expected to deliver no less than 1,000 HP.
The Hennessey Cadillac CTS V Coupe is powered by a twin-turbo LS V8 Engine on which the tuner has fitted a new crankshaft and intercooler, plus it upgraded the fuel injectors and fuel system. The engine’s control unit has also been remapped, and apart from developing 1,000 horses at 6,400 rpm, the car is also expected to deliver 950 lb-ft of torque at 4,000 rpm. 
Hennessey says their highly modified Cadillac CTS V Coupe is going to accelerate from 0 to 60 mph in 3.5 seconds and will reach a maximum speed of 230 mph.
It all sounds great, but it remains to be seen how much will Hennessey charge for their program, which will be produced in limited numbers (12 units only).

Source: Hennessey Performance