Originally Posted by SickFinga
The biggest problem on E36 is diff mount. You might either rip entire subframe from the floor or you will break diff mount bolts.
That can happen without any power addons.
If it's US Spec M3, then it's the same tranny as your stock one.
My car was a 328 when I start so it was a getrag not a ZF. I agree must reienforce the subframe as I did. Completely reienforced rear end I mean everything.