This is not a comprehensive answer, but I know the 01-04 Corvette Z06 came with the M12 and the 97-04 C5 Coupes and Convertibles came with the MN6. Only difference between them is the gear ratios. :cheers
The GTO and all C6's have the M12. The F-Bodies have the MN6. The MN6 was not rated to handle same HP as the M12, in addition to the gear ratio changes. I believe there were difference in the internals, but I'm not sure what.
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