The AMG GT 63 S 4MATIC+ E Performance is the most powerful road-legal AMG before the prohibitively expensive Mercedes-AMG One. In stock form, this four-door plug-in coupe produces 831 horsepower (620 kilowatts) and 1,033 pound-feet (1,400 Newton-meters) of torque.
However, unlike the complex AMG One hypercar, which requires an engine rebuild every 50,000 kilometres (about 31,000 miles), the AMG GT 63 S E Performance can be tuned aftermarket.
Case in point: Opus presenting its stage 1 performance tuning of the PHEV.
The Nurburgring-based tuner improves the AMG GT 63 S E Performance to produce up to 952 hp (710 kW) and 1,143 lb-ft (1,550 Nm) of electronically limited torque. The electronic unit adds 204 hp (152 kW), while the 4.0-liter M177LS2 V8 produces 748 hp (558 kW).
Of course, these figures translate to thrilling performance. Opus claimed a sprint to the century mark (62 miles per hour) in just 2.7 seconds from a complete stop, which is slightly faster than the production model. The 200 km/h (128 mph) mark can be reached in 8.55 seconds, one second faster than in stock form.
The tuned version is also quite quick. Opus tested the tuned AMG GT 63 S E Performance on the Autobahn and achieved 321 km/h (199 mph), which you can see in the video embedded above.
After receiving TUV approval, the Opus-tuned AMG GT 63 S E Performance will be available for purchase in October 2022. A special exhaust flap control system and an OBD lowering module are also available from the company. Opus has stated that it will attempt to break the 1,000-hp barrier in the winter, though the tuner admits that it will be difficult compared to non-hybrid AMGs.
 and 1,033 pound-feet (1,400 Newton-meters) of torque.){kind=link}