French racing firm Exagon Motors is continuing the development of its Furtive e-GT, a new all-electric sports coupe that we first laid eyes on at last year’s Paris Motor Show.

The company recently showed off a validation prototype at the Magny Cours racing circuit in France with Nicolas Prost, who is the oldest son of four-time Formula One World Drivers’ champion Alain Prost, sitting behind the steering wheel of the 2+2 model.

The Furtive e-GT is scheduled to go on sale in late 2012 with the company planning to build around 100 cars per year. The 2+2 seater coupe will be offered in two flavors, a standard model powered exclusively by two electric motors and a more sophisticated version equipped with an internal combustion engine range extender that works in a similar way to the powertrain system found on GM’s Chevrolet Volt.

The standard model features two Siemens-sourced electric motors each producing 125 kW, for a combined output of 340-horsepower at 5,000 to 10,000 rpm and a constant torque of 480Nm (354 lb-ft).

The electric juice is stored in a set of lithium-ion batteries delivering 50kWH, which are claimed to provide a life of approximately ten years with 3,000 recharge cycles. Exagon says they provide a pure electric driving range between 197 to 402 km (122 miles to 250 miles), depending on the conditions of use.

The optional range extender, which will make use of a yet-to-be detailed small displacement engine that recharges the batteries directly and does not drive the wheels, increases the range to 807 km or a little over 500 miles.

Exagin says the Furtive-eGT can accelerate from 0 to 100 km/h (62mph) in just 3.5 seconds and reach a maximum speed of 287 km/h (178mph) on the race track, but will be limited to 250km/h (155mph) for the road.

Video via Youtube / Supervroom

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