You guys have too new/expensive cars! Thats the beauty of the 80's and early 90's models, you can swap differentials like nobody's business! I just put a limited-slip 3.27 from an older 380SL on my 500 Euro and it made a world of difference. I started with the stock 2.47, then went to a 2.82, and finally to a 3.27- all from different models. I could even take a 3.47 or 3.50, (forget which one), from an old 350SEL and it would bolt right in too! You guys could try the wagon's differential (3.27) but don't think you would get much traction... Do they come in limited-slip??

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Mike
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