Everyone knows that the 6.2 engine of the AMG 63 undergoes some detuning as you go down from class to another, or so i've always heard, however, a friend of mine drives an AMG CLS 55, and is good friends with the technical cheif (or maintenance Dept. cheif i can't remember, the guy is a german Eng.) at Mercedese dealership here in my region, he told my friend that wasn't true and that Benz claims so to sattisfy bigger-AMG buyers ... so, an experts enlightement is needed 
