Diy sheet metal ram air?
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makes it a bad heat absorber; you can see IAT come way
up swapping one of these onto a stock-cold-air car.
If I were you I'd consider something like ABS sheet, easy
to cut and solvent- or hot-air weld, capable of forming
with a heat gun, cheap and available in basic black. Way
lower thermal conduction and heat-mass than steel.
But consider, too, that airflow is helped only a little and
where you draw from (temperature) matters more than
cross-section forward of the filter element.








