Mercedes CLK63 AMG Black Series by Renntech

Therefore, any tuner wishing to enhance this package has a challenge on their hands - a challenge Renntech was more than willing to take with the release of their latest tuning program.

The monstrous 6.2-liter AMG engine already pumps out 507hp and 630Nm of torque, but the Mercedes tuner has managed to pump this up to 550hp with an additional 60-80Nm of torque - all these achieved with a bit of ECU tuning and the addition of long-tube headers and a motorsports style exhaust sharpening throttle response.

"Real-world performance is all about torque, not so much about peak horsepower number at very high rpms," explains Hartmut Feyhl, company founder. "It can be very easy to build high rpm horsepower, but to get instant throttle response and mid-range acceleration, it is more difficult - and this is where customers really want to feel that improvement."

For additional drivability, Renntech has intsalled its own sport suspension system, lowering the car by an extra 3/4 inch and added carbon fibre stut braces to both the front and the rear. It's also fitted with fully-adjustable camber bushings at all four corners which enhances mechanical grip in fast corner.

The aerodynamics are enhanced with the addition of a front splitter and rear diffuser along with the striking carbon fibre rear wing.

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