It’s as inevitable as night following day – when Mercedes-AMG launches a mental new car, Brabus will get hold of it and turn the mentalness up to 11. And so it has come to pass with the Mercedes-AMG GT 4-door, which has received the Brabus 800 treatment.

It begins life as a Mercedes-AMG GT63 S 4Matic+, complete with a 639hp, 664lb/ft version of AMG’s 4.0-litre, twin-turbo V8. That’s a pretty profound quantity of power and is enough to lob the AMG GT63 S from 0-62mph in just 3.2secs and on to a limited top speed of 196mph. This in a car that’s 16.5ft long and that weighs 2.1 tons.

From that starting point, Brabus adds its own turbo set-up and an upgraded ECU, boosting output to 800hp and 737lb/ft of torque. That’s an awful lot of power.

Three tenths are shaved off the 0-62 time, which drops to 2.9secs. We think we’re right in saying that the only saloon that’s faster is the Ludicrous Mode-equipped Tesla. Top speed is unchanged because 196mph is plenty fast enough, thank you very much.

The Brabus AMG GT63 S retains the standard car’s 8-speed dual-clutch gearbox and rear-biased four-wheel-drive system. The air suspension is rejigged to sit 25mm lower to the road.

There’s the usual raft of carbonfibre body add-ons and 21in front/22in rear wheels of Brabus’ design. There’s a new exhaust with titanium and carbonfibre tailpipes and a quiet Coming Home mode. We’d leave it set to Sport to go everywhere making enough noise to wake the dead.

Brabus makes over the interior with lush leather and lots of Brabus-branded detailing, as well.

You can either buy a complete car like the one pictured here – price on application – or you send Brabus your £135,000 AMG GT63 S to be upgraded in stages. We’d just get the engine, exhaust and suspension mods for the full ‘sleeper’ effect.

The Brabus 800 treatment is available on every other Mercedes-AMG 63 variant, as well.

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By Graham King