The main changes to the Mercedes-Benz DR520 are reserved for the engine, it has been claimed. When comparing the power to standard models an article on Auto Express claimed that this model has 513 hp which is 62 hp more than other vehicles. The car is much more powerful because of the AMG Performance Pack Plus which has been added to it which brings new con rods forged pistons and a revised crankshaft said the website.

Ask the AMG engineers at Brooklands in Surrey, and they reckon DR should stand for de-restricted, as top speed has been raised from 155mph to 187mph the review said. But no doubt about it the car is incredibly quick.

The engine is great, providing a broad spread of torque and effortless acceleration in any gear, at any speed. It sounds fantastic, emitting a guttural roar from its quad exhausts. However only a total of 20 DR520 cars will be available in the form of 15 saloons and 5 estates.

As there only so few units available to buy however the DR520 will also be available as a driving experience for the motoring enthusiasts. Writing a review for Car Magazine, Ben Barry explained that the model feels as flexible and burbly and torquey as the Mercedes-Benz C63 AMG – the car it is based on. The suspension is firm and well-controlled while still compliant, the steering beautifully weighted and consistent, the brakes endlessly strong, the seven-speed auto gearbox smooth and quick, Mr Barry observed.

And ignoring its handful demeanour the car is in fact tameable. If the driver feels daring they can turn the systems off and experience a raw drive. This is the ultimate C63, Mr Barry insisted, adding that any model that can morph from a family runabout to the most sideways thing on the street without breaking sweat is worthy of praise. So no wonder we are now all after the Mercedes DR520.