The Mercedes-AMG GT63 S 4-Door is already quick. For those who are not yet contented on the performance of the car, Posaidon recently released its tuning package for it. The kit provides over 800hp to the auto.

The Mercedes-AMG GT63 S 4-Door carries a 4.0-liter twin-turbo V8 engine. The power unit is already good for 630 bhp. That takes the car from 0 to 62 mph in only 3.2 seconds despite its size and weight.

With Posaidon’s RS 830 tuning pack, the numbers of the AMG GT63 S 4-Door are raised to 819 bhp and 811 lb-ft of torque. These are thanks to the tuner’s new turbochargers, charge air-cooling system upgrades, improved flow of downpipes, performance air filters, and enhanced catalytic converters. The software of the car was also tweaked as well as its nine-speed sports transmission.

The figures make the AMG GT63 S 4-Door faster allowing it to sprint from 0 to 62 mph in 2.9 seconds. The speed limiter of the auto was removed too. Flooring down the gas pedal lets the car zoom on the road up to 217 mph.

The RS 830 package starts at €24,000. There’s still an option to make the AMG GT63 S 4-Door go further than the mentioned specs. The RS830+ of Posaidon gives the vehicle 868 bhp and 885 lb-ft of torque.

The changes in the AMG GT63 S 4-Door appear to be mechanically-inclined only. The exterior and interior of the car remain the same.