I'm having a problem understanding your problem! The engine is supposed to rev while driving. Are you experiencing late upshifts? You will never get the same noise from an unloaded engine as a loaded.

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600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis.

i don't believe in the lord! He's never bought me a Mercedes Benz.