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Don’t think the Mercedes-AMG GT 63 has enough muscle? Relax. The folks at Affalterbach have your problem solved. The 2025 Mercedes-AMG GT 63 Pro 4Matic+ packs 26 more horsepower, 37 lb-ft more torque, and will get from a standstill to 124 mph in 0.5 second quicker than the regular GT 63 en route to a top speed of 197 mph.

There are no new go-faster bits under the hood; the GT 63 Pro’s 4.0-liter twin-turbo V-8 is mechanically identical to that of the GT 63. The extra muscle is all down to software that enables that wonderfully versatile AMG powerplant to produce 603 hp from 5,500 rpm to 6,500 rpm, and 627 lb-ft of torque from 2,350 rpm to 5,000 rpm. The GT 63 Pro’s chassis setup is similar to that of the regular GT 63, too. That means AMG active ride control suspension with active roll stabilization, and rear-wheel steering.There’s more to the GT 63 Pro than just engine software, however. To make it a better track-day car, AMG engineers have increased airflow by way of a redesigned front fascia and upgraded both the high and low temperature cooling circuits to ensure optimal drivetrain temperatures. Two radiators are now positioned in the left and right front wheel wells, and the top-mounted radiators for the front and rear differentials, along with the transfer case of the AMG Performance 4Matic+ all-wheel drive system, are now actively cooled by way of electrically operated water pumps.The GT 63 Pro also gets AMG’s unquenchable carbon ceramic composite brakes as standard. Clamped by six-piston calipers, the 16.5-inch front rotors are the largest currently available from AMG. The backs of the carbon ceramic discs are made of titanium to further reduce unsprung mass. Also standard are lightweight 21-inch forged alloy wheels fitted with Michelin Pilot Sport 5 tires—295/30 ZR 21 at the front and 305/30 ZR 21 at the rear. Ultra-grippy Michelin Pilot Sport Cup 2 R tires are available at no additional cost.

The GT 63 Pro also gets revised aerodynamics for better high-speed balance, with an active air control system in the restyled front fascia, active underbody aero, and the fixed rear wing from the AMG Aerodynamics Package. Schiebe says front axle lift has been reduced by over 66 pounds, while the rear wing—working in conjunction with underbody air deflectors like those on the Mercedes-AMG ONE hypercar—has increased rear axle downforce by 33 pounds.

In terms of the visuals, the GT 63 Pro’s front splitter, side sill trims, rear diffuser and rear wing are all rendered in carbon fiber. Black-painted brake calipers lurk behind the matte-grey alloy wheels. Inside, the GT 63 Pro features AMG Performance seats and an AMG Performance steering wheel in Nappa leather and microfiber.The Mercedes-AMG GT 63 Pro 4Matic+, which is expected to arrive in U.S. Mercedes dealerships early next year, won’t be the ultimate AMG GT. Michael Schiebe won’t be drawn into revealing more detail, but he insists Mercedes-AMG is “100 percent committed” to customer racing. And that means there will almost certainly be a more extreme Black Series-spec GT in the future, as this will allow Mercedes-AMG to homologate GT4, GT3, and GT2 race versions of the car to sustain its highly successful customer racing business.

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