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Personally, I think the affect is negligible. Yes aluminum is a better conductor, but that's not to say it has an effect in this application.
Plastic absorbs heat too, it just does it slower than aluminum. But what's to say that makes a difference here? Maybe in this instance the engine bay is hot enough to heat up both equally in 10 minutes. Two cars side by side with an IR thermometer would answer that easily.
What's too say the air isn't passing so quickly by that there is little to no difference in temp?
What's to say the aluminum pipe is thick enough to absorb enough heat to make a difference?
My point is. You can spit facts, but the facts also have to have a distinct affect to be proven right in this application.
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