Quote:
Originally Posted by bradleyland
When we look at the M135i, the engine is a vanilla N55 with a different software package. That I'm aware of, there are no physical changes to the engine internals. This is the case for all MXXXi models. The engine is a production variant with some minor changes; usually software.
So, the engine in the M135i may be designated as an "M Performance" engine, but that is a marketing label only. The enthusiasts here on Bimmerpost prefer to look at what the engine actually is, rather than what label is assigned to it.
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You are incorrect in that assumption- The M135i has a forged crank and different rings additional cooling and of course software. There will more to the next version.