Bentley is testing a new Continental GT V8 prototype at the Nurburgring, Germany. Spy photographers believe it to be the new range-topping V8 RS model. IMAGE GALLERY: Bentley Continental GT V8 RS (Spy)The car has no disguise, revealing an updated lower front bumper with changes to the air intakes and aerodynamics. At the rear you can spot a fixed spoiler and the standard quad exhaust tips found on V8-equipped Continentals.The current range topping V8, the Continental GT V8 S, is powered by a 389kW4.0 litre twin-turbo V8, enabling it to rocket from 0-100km/h in 4.3 seconds on to a top speed of 310 km/h. The engine clearly has more potential and we expect it to produce around 410kW in this new model, along with changes to the suspension.