if I ever get an E31...it would have to be the 4.0 V8
the V12 is cool but each bank has its own TB (and they're linked) and its own engine computer (there are 2!)
it is very cramped in there.
at least with the V8, there are tons of common parts with the E38, E34 and even E36
like all BMWs of that era, the cooling system is very fragile and likely needs replaced every 80k miles (rad, hoses, water pump) because they WILL fail and blow Headgaskets faster than you can get down the strip in a funny car