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2021 Mercedes-AMG GT73 spied winter testing

The performance wing of Mercedes-Benz has tested its electrified four-door flagship in the snow.
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Mercedes-AMG’s new performance plug-in hybrid GT 73 has been spied completing winter testing in Sweden.

With most of the test mule’s camouflage removed, it’s clear to see just how extensively the model’s styling has been lifted from the four-door GT 63.

Large air dams reside up front while chunky, twin-tip mufflers rest on either side of a rear diffuser.

However, Mercedes has kept the covers on the GT 73’s rear bumper and – most importantly – its charging port.

The GT 73 is expected to use the same 4.0-litre turbocharged V8 engine found in the GT 63, although the new flagship model will have its engine mated to a hybrid system.

This should push outputs “up to 600kw” and bring the 0-100km/h time to less than three seconds. By way of comparison, the GT 63 outputs 470kW and sees 100km/h from a standstill in 3.2 seconds.

The Mercedes-AMG GT 73 is set to compete with Porsche’s performance hybrid four-door offering, the Panamera Turbo S E-Hybrid Sport Turismo.

Mercedes-AMG has previously teased a 2020 debut for the model.