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2.5inch intake tube would work fine as the 3 inch tube will make it bog a little at idle. (it does on my car)
fiberglass would be easier to make and i would say they are both pretty fragile.
they should both hold up even though its a scoop into the engine bay.
and they should both be able to reduce heat better than metal and cool down faster than metal since the dont really absorb the heat like metal. Also you have cold air being sucked into the scoop almost like a ram air so im sure it would keep air temp down and intake temp.
its a good idea and adds a little bling to the bay.
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