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Believe it or not, I tend to think M2 OG stock actually makes a little more than the independent numbers first gotten in USA in summer 2016, which are low because M2 is sensitive to temperature like no other BMW.
Last winter, I myself organized a dyno day where a stock M2 sample put down 340whp, repeatedly, on RON98 on a low reading dynojet, the same day M4 ZCP showed only 397whp.
In my opinion, 350+whp with RON98(AKI93) and 340 with RON95(AKI91) would be true numbers, corrected to STD, if your octane lives up to its rating, which is a big IF for middle and west USA.
EAS number is a bit high (in fact the highest reported ever seen for a 91 M2), but still within acceptance range.
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Lemania 2320
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