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Discussion Starter · #1 ·
I asked a knowledgeable person (certified BMW mechanic, BMW performance upgrader, general nice guy) about the possibility of transplanting an M5/M6 engine and M6 LSD into a 645Ci. Keep in mind that his estimates are including his labor:

"I'm still convinced that to do the swap would be 25-40K before it was done. This would not be just a pull one out and stick another in. All the water and oil plumbing is different, the harnesses are different. Just not worth the time and effort considering what you can go buy an M for. Differential change is an unknown, haven't done one, if they are electronically controlled it will be tough to do and have work. I can do some research and find out what it would cost."
 

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Discussion Starter · #3 ·
Not sure. But the M5 and M6 both share the same motor, don't they? It might also take a swap of the SMG tranny, too...
 

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your gonan need the smg tranny, if you want to do the swap.
 
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