Not Ranked
There are "loads" of turbo converted M3 and 5s over here with anywhere from 600 to 1000 and above hp. They seem to manage with BMW diffs. The last one I saw had wheel slip when it passed 800hp/600lbft. They used an E28 745i diff. Others use the alpina turbo diffs.
The M5s are more used than the M3s for the 1k builds, maybe the M5 diff from the E34 fits straight into your frame?
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