In standard configuration, the Mercedes-AMG S63 Coupe S packs a mean punch. It’s powered by a 5.5-liter bi-turbo V-8 engine that spits out 577 horsepower and 664 pound-feet of torque, allowing it to sprint from 0 to 60 mph in 3.9 seconds to go with an electronically limited top speed of 186 mph. By most metrics, those numbers add up to a car that’s as potent as they come. Then again, that sentiment doesn’t mean much when you’re talking about a tuner like Fostla whose business has always been about giving cars like the AMG S63 Coupe S more power at their disposal. And so, the German tuner is here to present its latest tuning kit, a walloping program for the high-performance Merc that comes with an increased output of 740 horsepower and 885 pound-feet of torque.