Straight out of the box the Mercedes-Benz CLK 63 AMG Black Series is already one of the most extreme production cars on the planet. With a full DTM-style wide-bodykit, carbon-fiber lined interior and a thunderous V8 engine pumping out 507hp (373kW), few would feel the need to lift the performance of the car.

However, for the guys at Kicherer it appears that nothing can be too extreme. The German tuner has set about boosting the output from the already high-strung engine – lifting power by 33hp (25kW) to a new peak of 540hp (403kW).

With the added power, the car will now accelerate from 0-62mph (100km/h) in just 4.1 seconds and reach a top speed in excess of 300km/h (186mph).

Kicherer has also replace a lot of the standard plastic and metal trim details with new carbon-fiber pieces, including the front grille slats and new carbon bucket seats. There’s also a new set of H&R springs and a set of lightweight forged alloy wheels.

Kicherer Mercedes-Benz CLK63 AMG Black Edition