The Mercedes-AMG GT family will go out with a big bang, as the GT R Black Series is expected to launch as the swansong of the range that has been around since 2014.

A previous report has indicated that it might debut in China, at the 2020 Chengdu Motor Show that runs from July 24 to August 2. Now, another rumor claims to provide insight at the new model’s magic performance numbers. According to Fastabast, a Nürburgring taxi company, the 4.0-liter twin-turbo V8 engine has been massaged to pump out 710 HP (720 PS / 530 kW) and 627 lb-ft (850 Nm) of torque.

The extra oomph, advanced aerodynamics and weight savings will apparently allow it to sprint from 0 to 62 mph (0-100 km/h) in just 3.3 seconds and on to a top speed of 199 mph (320 km/h).

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To better put these numbers into perspective, we will remind you that the GT R Pro, which is the current range-topping variant, has 577 HP (585 PS / 430 kW) and 516 lb-ft (700 Nm), the same as the regular GT R. It needs 3.6 seconds to go from nought to 62 mph (0-100 km/h) and flat out it will do 198 mph (318 km/h).

The quoted source also claims that the GT R Black Series is capable of lapping the Nürburgring Nordschleife in just 6 minutes and 58 seconds, or 13 seconds slower than the Lamborghini Aventador SVJ, the official record holder. This is also a 6.6-second improvement over the GT R Pro, which completed the course in 7:04.632.

These numbers do sound realistic, but without official confirmation they are pure rumors, so don’t forget to take them with the proverbial pinch of salt.

Correction: The new Black Series is (reportedly) around 6.6 seconds faster than the GT R Pro, not 4.6 seconds as originally stated