What is the difference between the engine of c63 e63 s63 (not s65) and the poor performance?
First of all, because the platform is different. C e is modified based on its own platform. Like s63.s65, the body specifications are basically the same as S-class. Just changed some AMG wheels, engines, brakes and aerodynamic kits. Secondly, because each AMG engine is "one person, one machine" in the Mercedes-Benz factory. It means that every AMG engine is made by Mercedes-Benz engineers. Really focused. And everyone's adjustment is different, so look at the engineer's signature on the engine of AMG model, which is the way it is.