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My experience
I have a bone-stock M2 6MT with only the Dinan FMIC installed.
At LRP last week, it was high 80 degree temps and high humidity. Sessions were 1/2 hour long and I saw no elevated engine temps or power drop (perceived, anyway). It's difficult to determine exactly w/out OBD data (IATs, EGTs, Oil Temps, etc.) but the car was very strong all day, from run 1 to run 15 each session.
I'm sure the Dinan FMIC makes a significant impact here, as the factory M2 intercooler (exactly the same as the 230/240i intercooler) would probably heat soak in minutes...if not seconds. It's a very small FMIC.
My $.02
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