Even though the W212 Mercedes-Benz E 63 AMG has been replaced with the new W213 Mercedes-AMG E 63 4Matic+, German tuning company Posaidon is adamant about extracting more power from the super sedan.

Here’s their latest effort, the Posaidon E 63 RS850+, which ekes out a monstrous 1,020 hp and 1,400 Nm of torque. That is significantly more than the 585 hp/800 Nm offered by the car it is based on the – the E 63 S AMG.

The work of squeezing that much power from the motor is pretty substantial, and it starts with replacing a large number of parts. Among the swapped out items are the turbochargers, cooler packages, air filter and intake system, spark plugs and exhaust system. Posaidon also offers an option of increasing the engine’s displacement from its stock 5.5 litres to 6.5 litres, should you desire.

To make sure the rest of the car is capable of coping with the increased output, the seven-speed dual-clutch automatic transmission has been strengthened, along with custom limited slip differentials front and rear.

In terms of performance, Posaidon claims a zero to 100 km/h sprint time of just 2.8 seconds – nearly a full second faster than the standard car. Theoretically, the car will hit a top speed of 368 km/h, but it is limited to 350 km/h to ensure the tyres aren’t overloaded. On a related note, the speedometer is also replaced with one that has a higher speed reading.

Those tyres are paired with 20-inch ADV.1 wheels, and the car now rides on adjustable coilovers. To ensure the car is capable of stopping properly, there is a carbon-fibre braking system, with six-piston calipers at the front, and four-piston ones at the rear.

While the changes under the metal are immense, the car’s exterior is pretty reserved by comparison, save for the camo wrap applied. However, a large number of body panels and components have been replaced with carbon-fibre ones to save weight, and the radiator grille is just a net to improve cooling.