A concept sedan branded as the Mercedes-AMG GT4 will reportedly be unveiled at the Geneva motor show, taking place in early March, to kick off the tuner's 50th anniversary celebrations.

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Sources have told Autocar that the GT4 concept has a shape that's very much like a five-door version of the Mercedes-AMG GT coupe. The GT4 concept is said to preview a new and unique model for the Mercedes-AMG sub-brand.

Despite its visual proximity to the GT coupe and convertible, the GT4 won't use that car's bespoke platform. Instead, the production GT4 will be based around the front-engine, rear-wheel drive MRA architecture that Mercedes-Benz uses for all its vehicles from the C- through to the S-Class.

Power for the GT4 reportedly comes from AMG's 4.0-litre turbocharged V8, with a 3.0-litre turbo V6 also a possibility down the track. The V8 engine may be paired with a 48V electrical system, a small electric motor, and an all-wheel drive system with drift mode.

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Above: Mercedes-AMG GT S coupe.

To help further differentiate the GT4 from the AMG variants in the regular Mercedes-Benz range, the GT4 is said to feature a unique track and wheelbase, as well as greater use of lightweight materials, including aluminium and high-strength steel.

It's thought that the production version of the GT4 will go on sale globally during 2018. In effect, it will act as a replacement of sorts for the reportedly not-to-be-renewed CLS Shooting Brake.

According to the magazine, the GT4 is being developed under the codename 'X290' and will be pitched against the Porsche Panamera, BMW 6 Series Grand Coupe and Audi A7.