We have a plug-in ECU for the M50 as of 2014, but gained traction and refinement in 2015.
https://shop.vems.hu/catalog/vems-motronic88-p-187.html (Entire World)
or
https://www.vems.com/engine-management/m50-pnp.html (US Customers)
The BMW M50 family is popular in the e34 and e36 chassis cars from 1992-1995. The S50 in the US is compatible with the M50 plug-in ECU. The S50 in Europe is a different engine, but we also support that.
If you would like to wire the ECU into the car, for a motorsport application or similar where the full BMW harness is not needed or wanted, you can specify an ECU with 8 Ignition Drivers, EGT if desired, VR/VR for non-vanos (m50b25) or VR/Hall for Vanos (m50tub25), 30V flyback, 400kpa (or your preference) MAP sensor, 2 knock input channels.