Originally Posted by Wild Squid
BMW has fucked us real good by building a restricting engine.
The N55 has bigger intake valves and longer duration cams.. both things that (all else being equal) will allow the N55 to overpower an equally equipped N54.
The only thing that is restrictive is the turbo, and there will be replacements in time.
Oh, and FWIW, crankshafts don't break because they are overpowered, they break because they are either unbalanced, or are being acted on unevenly (misfires at high power, etc). A well tuned engine in this day and age, even with a cast crank, should easily be capable of the levels Vishnu's big single is putting out. It's all in the tune (and upkeep/maintenance).