All I can tell you is that I have at least glanced at every post on here in over 5 years and it is not an issue that has been discussed. Of course people have had some issues, but generally the N63 has been pretty reliable. But I'm not recalling engine issues attributed to heat beyond external rubber and plastic. With the potential problems you list with those mods it's my view you are creating more problems than you are solving. But do what you want.
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