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Originally Posted by m2not1LE

Other sources claiming +21 or +22 HP, though likely due the small difference between US SAE Net and PS (PferdStarke) German rating differences.

So probably +20 US SAE Net, with peak torque remaining fixed regardless for manual trans cars. Automatic (ZF 8 speed) car's may gain an additional albeit very tiny advantage in accelerative performance due to stated peak engine torque increase, which in theory result in a very slight increase in average HP under the utilized area of the HP curve. This should slightly improve overall derivability and perhaps reduce automated gear changes.

+20hp increase confirmed for Model Year 2025 M2 (G87)