In the new GT63 Pro 4Matic, the second-generation AMG GT's 4.0-liter V-8 makes peaks of 603 horsepower and 627 pound-feet of torque.

Enhanced cooling and aerodynamics are the main changes to the car, which also gets standard carbon-ceramic brakes and optional track-biased Cup R tires.

Deliveries of this 2025 model are expected to start early next year.

Engine Details
The adaptability of AMG's long-serving 4.0-liter twin-turbo V-8 means it has already been offered in outputs ranging from 450 to 750 horsepower and in both cross-plane and flat-plane-crank derivatives. The new GT63 Pro uses the regular cross-plane variant, which has only been modestly boosted when compared to the existing GT63, now making peaks of 603 horsepower and 627 pound-feet, increases of 26 hp and 37 pound-feet respectively. As with the GT63 it has 4Matic all-wheel drive and a nine-speed automatic gearbox that uses a wet clutch in place of a torque converter. Looking at AMG's own numbers, the 3.1-second acceleration to 60 mph is unchanged from the regular GT63, but the Pro is claimed to be 0.5 second faster from zero to 124 mph, dispatching the tougher benchmark in just 10.9 seconds.

Substantial cooling improvements, though, have more relevance to the AMG's intended racetrack habitat than the modestly raised output. The Pro gets double high-temperature radiators up front, plus separate rads for the front and rear differentials. The electronically controlled transfer case, which apportions torque to each axle, is also actively cooled. Externally, there are also larger side intakes in the front bumper to help channel air to the brakes.
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https://www.caranddriver.com/news/a61570105/mercedes-amg-gt63-pro-4matic-revealed/