800-HP Mercedes-AMG GT73e Looks Ready To Fight The Porsche Panamera

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The new range-topping Mercedes-AMG GT 4-Door Coupe has been a long time coming.

Powered by a 4.0-liter twin-turbo V8 producing 630 horsepower and 664 lb-ft of torque, the Mercedes-AMG GT 63 S is the most powerful luxury sedan in AMG's fleet. However, we've known for a while that AMG is cooking up an even hotter range-topping GT 4-Door Coupe to take on the Porsche Panamera Turbo S E-Hybrid, and it's been a long time coming.

Rumored to be called the GT73e, AMG's new super sedan has been spied undergoing prototype testing in snowy conditions. A charging port on the rear bumper confirms the new super sedan will utilize a plug-in hybrid powertrain. Reports claim this will be AMG's most powerful GT model yet, with a colossal 816 horsepower to play with.

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Allegedly, AMG's 4.0 liter twin-turbo V8 engine will generate 612 hp, combined with a 204-hp electric motor. This setup will reportedly enable the GT73e to sprint from 0-62 mph in just 3.1 seconds and max out at 195 mph, while the electrified powertrain is expected to provide an electric driving range of around 27-31 miles. This same setup will also power the new Mercedes-AMG SL73.

Styling-wise, we aren't expecting any dramatic changes, but the camouflage suggests the front and rear bumpers will be more aggressive to distinguish the new range-topper. The styling changes could also coincide with the upcoming facelift planned for the GT series that will incorporate redesigned bumpers and new headlight graphics.

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We don't get to see inside the cabin, but the interior should carry over from the GT 63 S with a few minor changes. The GT73e could also inherit an upgraded infotainment system from the upcoming GT facelift.

It's still a mystery when the Mercedes-AMG GT73e will debut. AMG teased the new hybrid performance sedan back in 2019 hinting it will debut in 2020, but those plans were clearly disrupted by the pandemic. Hopefully, the wait will be over soon as this new prototype sighting suggests Mercedes is preparing to unveil the GT73e sooner rather than later, so there's a good chance it will debut this year.

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