Do you want your 104 to remain stock or not?

A stock M104 will do fine behind any of the W201 or W124 MT's. Slicks, a 3.6 and a heavy W201 will probably push the 8v trans to the limit, but otherwise, you'll be fine. The benefit of the non-dog leg boxes being that you have an OD and if you want to DD it or drive it on the highways, the M104 will appreciate the OD even with a 3.27 or 3.07 rear drive.

How you want to run your Engine Management will heavily influence your trans choice unless you're a competent fabricator. The reason being, single mass vs dual mass will influence your choices if you want to run an OE engine management. This will influence MT Choice.

As an aside, I've followed 202 Brabus on the rev. I do not understand how he's trashed so many parts with his setup. I think my car was heavier than his with relatively equivalent HP and the most I've toasted is a few subframes.

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1993 190E 2.6 Sportline