The Mercedes-AMG S63 is no slouch with 612 horsepower and 664 pound-feet of torque, but what if thats not enough? Well, according to famed tuner Posaidon, its not, and thats why were looking at this tuned version of the S63 today. The same 4.0-liter V-8 lives under the hood, but it now features revised turbos with upgraded ball bearings, new air induction, and a revised exhaust system with new downpipes and sports catalytic converters. In the end, the Posaidon S 63 RS 830+ is good for a whopping 880 horsepower and 885 pound-feet of torque. That kind of power enables this S63 to hit 60 mph in 3.2 seconds and on to a top speed of 217 mph. However, thats not where the story ends. Posaidon has another upgrade in the works that will raise the final output to as much as 940 horsepower and 944 pound-feet of torque. Unfortunately, Posaidon hasnt revealed straight-line performance figures for this upgrade, but it seems safe to speculate that 60 mph will come in around three-seconds flat. On that note, both of the upgrades weve discussed so far include physical upgrades, so if youre not interested in that Posaidon can give you as much as 707 horsepower and 737 pound-feet of torque via simple recalibration of the cars computer system. Rounding off the whole deal is an electronic lowering module for the AIRMATIC air suspension that will give the S63 a sportier right and more dynamic handling.