So how effective/necessary is that trans scoop for short sprint races...say 30 min?I have both. The aluminum one is lighter, but its not the end of the world in weight difference. They're both seemingly strong.
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In regards to the duct versus pan, I've hit one against the steel pan riding some curbing I shouldn't have:
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The pan won, but I will admit field-welding a steel pan is easier than an aluminum one depending on who you keep for company at track events.
I don't think you can go wrong with either one, but the steel one is a huge value at its sub-$300 price point. I run it right now, but the aluminum one will eventually go on a yet-unknown spare motor for my racecar.