The OP is right on the N54 powered 1M losing torque as temperatures elevated, it's no different than what we have already seen on the N54 powered 135 and 335i's.
We saw 60C IAT's on a single dyno pull in low 70s ambient temps so repeated track sessions will sure get the IAT's even higher. With that kind of IAT's most of us know that the DME will start to pull timing and power is reduced. A good FMIC will help keep the power more consistent here.
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