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Good question. When I put the M120 into the 107 I considered all this. I found that MB used the same drive shaft tube same axles and hubs. They made a change to the diff and called it the strengthened housing and changed the flex disks to thicker 4 web design. So it appeared that MB felt that the diff was the week link in going from the M117 to the M120. Beyond the M120 cars like the E55 started to get bigger drive shafts resplined hubs a newer 114mm wheel bolt circle with 14mm wheel bolts etc. So at 600HP you are really pushing the envelope especially on the diff which apparently was the first thing MB changed. For that reason and others I elected to go with the 129 strengthened diff at the time. I have since reinstalled the original 107/126 diff, and about to upgrade to a 2.82 gear ratio. So I also have concerns but I am only at 400 HP. I will certainly be watching this thread see where the week links are.
Incidentally HP means nothing in this equation it will be all about torque.
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