A prototype of the 2015 Mercedes-Benz C63 AMG Sedan was spied conducting last-minute testing on the Nürburgring.

A prototype of the 2015 Mercedes-Benz C63 AMG Sedan was spied conducting last-minute testing on the Nürburgring.

Rumored to be unveiled in sedan and estate forms on September 24, the highly anticipated C63 AMG is back in a fresh spy video allowing us to hear its newly developed V8 twin-turbo 4.0-liter engine. It's actually the same motor which powers the AMG GT but in the C63 it will reportedly develop 476 PS (350 kW). There's also going to be a C63 S variant packing an estimated 510 PS (375 kW) together with larger brakes and a few visual differences.

Judging by recent AMG products, the new C63 AMGs will look restrained compared to what they hide under the hood but the driver will know immediately after pressing the gas pedal that he's in a car tweaked by the team in Affalterbach.

A public debut will likely occur on October 2 during the first press day of the Paris Motor Show. In 2015 and/or 2016, Mercedes-Benz and AMG will launch C63 versions of the yet unreleased C-Class coupe and cabriolet.

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