Mercedes-AMG is the high performance division of the Mercedes-Benz car company. Mercedes-Benz acquired majority interest in AMG in 1998.
AMG or Aufrecht Melcher Großaspach was founded in 1967 as AMG Motorenbau und Entwicklungsgesellschaft mbH (AMG Engine Production and Development, Ltd.) by former Mercedes engineers Hans-Werner Aufrecht and Erhard Melcher in a town near Stuttgart called Großaspach."AMG" is an abbreviation that stands for: Hans Werner Aufrecht (A) and Eberhard Melcher (M) who were partners, while Aufrecht’s birthplace of Großaspach (G) supplied the third letter in the company name.
And for this particular W221 'supercar' ... The S 63 AMG and the S 600 makes the same sprint in about 4.6 seconds. The twin-turbo V12 in the S 65 AMG is also found in Mercedes roadster SL 65 AMG.