Congrats. I feel as though your expenses for the engine swap have only begun, but good luck.
I do not KNOW, but would be willing to bet you would need an ///M3 ECU. The S52 engine is considerably different from the M50 or M52, but I would assume that you could still do the OBDII-OBDI conversion if you could find all the necessary parts from an S50 engine. Either way, your gonna need an ///M ECU.
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