Quote:
Originally Posted by mkoesel
I agree with you on that - that's a good baseline rule.
I guess my point was, the "M" has tended to indicate a power increase: M40i models make more power than 40i models, M50i models made more power than 50i models when the two briefly coexisted (the 750i is an outlier since it would surely be an M750i if not for the unique M760i V12 model).
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I have the feeling BMW is just sticking "M" to the front of whatever they came up as top-of-the-line powertrain (and give them the M-Sport treatment) for each model, without thinking much about it otherwise.