Now I'm intrigue!
I have a 97 E420 with a 2.82 diff. and the 5 speed transmission.
The car is very fast but not from 0-20mph.
If I got the diff from a E320 (3.07 diff), assuming it can easily fit (suppose it should), the car should be amazing.

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)