Based on the Mercedes-AMG GT sedan concept from 2017’s Geneva motor show, the GT 4-Door Coupe is a swooping, Porsche-bashing sleek sedan. Visually based on the AMG GT range of coupes, the GT 4-Door family is actually engineered around the same MRA modular architecture that sits beneath the E-Class, the C-Class and the CLS. AMG engineers go-fast versions of all of them, so the chassis, suspension and powertrain development wasn’t exceptionally difficult for the brand, except for attaching some carbon fibre reinforcement in the centre and the rear end (similar to what Audi and Lamborghini have done with the R8/Huracan twins). The top-end version doesn’t quite hit the concept car’s claimed sub-three second time, but it doesn’t miss by much, ripping through to 100km/h in a claimed 3.2sec. The all-wheel drive AMG will reach out to 315km/h with the 470kW GT 63S version of its biturbo, 4.0l V8 engine or 310km/h with the GT 63’s 430kW output. These motors are both familiar, but the six-cyli...

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