The eight-cylinder is currently being modified to meet EU7 emissions standards.
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The power output has risen to 671 hp (500 kW) and the 0 to 100 km/h sprint is now dispatched in 3.5 seconds.
They call it the Brabus Stealth Green Exclusivity Package.
This package is limited to 10 units worldwide so act fast if you fancy the black and gold drop-top rocket.
Should you fancy this insane upgrade, you going to have to dig deep as the package costs $94,980 (approx. R1,8m) without the car.
Fancy this conversion? Well, firstly you need to own the mighty sedan and then part with a further €323,435 (approx. 6.8m) excluding VAT.
Mercedes is investigating this as it could mean the units that have already been produced and delivered may need to be recalled.
The tuner starts off by making some significant changes to the engine including a modification from 4.0-litres to 4.4-litres.
It is expected to arrive with a plug-in hybrid setup, replacing the V8 with an engine with two fewer cylinders.
A whole 15 seconds faster than the LaFerrari.