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A documentation addressing engine sound changes in the Mercedes-AMG C 63, Model Series 205, following a software update. It explains customer complaints regarding alterations in engine sound after a software update aimed at optimizing transmission performance. The document details the cause as related to unintended changes in the engine and transmission control unit software. It proposes a remedy by updating the engine control unit and specifies the software requirements for this update. Additional dissemination of this information to customers is noted.