Noble has unveiled the M600 Speedster at Autosport International.

Noble has unveiled the M600 Speedster at Autosport International.

Described as a "research-gathering exercise," the prototype is essentially an M600 with the roof cut off.

Noble didn't have much to say about the car but they confirmed it is powered by a twin-turbo 4.4-liter V8 engine that develops 650 bhp (484 kW). It is connected to a six-speed semi-automatic transmission which enables the car to hit a top speed in excess of 200 mph (321 km/h).

While it's technically a prototype, Noble managing director Peter Boutwood hinted "If it makes production, our aim is for it to be one of the fastest cabriolets in the world."

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Noble M600 Speedster prototype unveiled at Autosport International