Let's look at the E63 AMG S first:
799.45 to the wheels but let's just be nice and round to 800. This output is achieved with AMS turbochargers, AMS airboxes, Weistec charge pipes, an AMS upgraded transmission, and a meth kit. Precision Tuning ties it all together.
Now onto the CLS63 AMG S which has Forced Performance turbochargers. It is on the stock transmission so the 847 wheel horsepower tune (wish we had the full graph with the torque) will likely be dialed down. Still, impressive peak figures on the stock motor and transmission:
Both cars are running methanol to hit these figures and that is important to note. It is also important to note that ~800 horsepower to the wheels is regularly hit with M157's these days. The platform is doing well.