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I'm sure that the heat transfer between the inlet tubes and their surroundings would be less for the polished tubes, but the question is.. are they losing heat to cold surroundings or gaining it from warm surroundings due to the heat from the engine combined with their position in a little nook between the cylinders where they may get less airflow.
My original statement implied that they were in a warmer environment, but I'm not at all sure that assumption is correct.
It fact, now that I think about it, it probably varies with speed. I guess they'd be heating at standstill though.
But, like you, I'd probably polish them anyway ....unless it was known to be detrimental.
I'm a sucker for the look of polished ally, but I also like its honesty and simplicity.
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