Inside the new sedan, it looks to be a cross between the GT Coupe and the E-Class. In boost mode, the engine earns 16 kW (22 hp) and 250 Nm (184 lb-ft) of torque over the standard output.
Headline GT Coupe is the 63 S which gets the 4.0-litre twin turbo V8 in 630bhp trim, backed up by 664lb ft of torque - both numbers outmuscling the 542bhp non-hybrid Panamera. The GT 63 and GT 63 S will start rolling out in early 2019, with the GT 53 following sometime mid-year.
Performance-wise, Mercedes estimates that the GT 63 S will do the 0-62 dash in juts 3.1 seconds, with the the standard 63 hitting the target in 3.3 seconds and the with the 53 in 4.4 seconds. It can sprint from 0 to 62 miles per hour in 10.5 seconds.
The GT 4-door comes with 4Matic+ all-wheel drive with torque distribution, with all power sent to the wheels via a nine-speed automatic transmission. A wet clutch is used here. So when the claim that the four-door GT "offers more space and greater versatility" is made, it's hard to see why someone looking for those traits wouldn't just opt for something like the excellent E63 S estate.
Speaking at the launch, Mercedes-Benz Cars chairman Dieter Zetsche said: "The A-Class has been a big driver of change at Mercedes-Benz". The new coupe will have rear-wheel steering, six or eight caliper brakes, and as with other AMG models, ceramic stoppers will be available as an option. A large, fixed rear wing and quad tailpipes housed in a rear diffuser also feature.
United Kingdom pricing and specification announced for new Mercedes-Benz A-Class
Mercedes-AMG has finally stopped the teasing and revealed its much-awaited high-performance four-door supercar. There's also the new steering wheel, which can be optioned with integrated controller, added buttons, and even a display for selecting the AMG drive programmes.
What it will all cost, AMG isn't yet saying, though we know the two-door version of the GT runs from around $113,000 to more than $157,000 for the track-ready GT R - before options. The latest coup from Affalterbach also lives up to the Mercedes-AMG brand pledge with regard to its high driving dynamics and sets the benchmark in its segment on the racetrack too.
For it to be family functional, you can choose from four- and five-seat configurations, but all versions come with 365 litres of boot space, with an additional 60-litre compartment underneath.
As the first four-door AMG GT model it combines high everyday comfort with diverse individualisation options and the latest sports auto engineering. Expect them to land in showrooms and sell fast leaving with the AMG cracks, bangs and pops that we so love.