I updated my earlier post regarding torque specs. I had posted the specs for a non M car. All is the same except the torque on the smaller diff bolts which is more on the M's compared to what I had posted.
The smaller of the bolts which break on the rear differential are torqued to 100 nm or 74 ft/lbs as opposed to the 47 ft/lbs I posted earlier.
The large diff bolt is torqued to 165 nm or 122 ft/lbs.