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M2 has a different turbo, based on the HP and power band.
The M2 makes peak HP @ 6500 rpms ; vs. X4 40M @ 5800 RPMs. Same for the M235i; peak HP in the 6000 rpms.
I don't see how the M2 could have this kind of power & power band without a bigger turbo.
Granted camshafts have something to do with the power band, but in order to make HP you need to make boost on the upper RPM range.
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