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Agree with others that coolant temps are not an issue. I datalog at the track, and the highest peak coolant temperature I've seen is ~208 F. In daily driving, temps stay between 195-203 F... meaning that even if you're constantly redlining the engine, coolant temps aren't affected that much over nominal.
IAT's seem to have a much bigger effect from what I've seen.
Lastly my friend had an overheating issue at the track with his supercharged E46 M3 and tried water wetter. It barely made a difference. Basically delayed the overheating by a few minutes. His coolant temps hit 240+ F either way.
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