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S68 will be in the next G90 M5 and will feature I hybrid power train I am guessing. I am also guessing that the S68 will have a smaller power output than the current S63tu4, and may even be a smaller displacement than 4.4L, but the drop in gasoline horsepower will be made up by the addition of an electric motor. The real question/challenge will be whether or not M can make a hybrid G90 M5 without increasing the overall curb weight over the current F90.
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