i made mine from cf.
made a practice one, when i was happy enough with that i made a second one to use as the template, the i layed the cf over top, so the cardboard is still on the airbox (just on the inside), cardboard is a terrific insulator so im not concerned about it being there.
m/s would work, it will hold heat once it warms up, and naturally its 2/3 heavier then ally but could be used. Ide still recommend cf or fg any day.
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