its metal on the turbo and the downpipe bcuz the turbo and downpipe are one of the hottest parts from the engine bay, its metal cuz its suppose to contain heat from the engine bay,and its not a metal heatshield its a heatsink, diffrence is the shield is suppose to keep heat away, sink is suppose to absorbe heat so it will be away from the unit, since the turbo produces heat itself , the heatsink provieds protection from the engine bay heat and at the same time it absorbs the heat created by the turbo
but your intake does not produce heat therefore, having heat stay in the area where you have your filter, is not gonna b any benefit to you, you cannot use the same principle as the heatshield on the turbo, with your intake you wanna try the best you can to deflect that heat coming from the engine bay
i got barely a drawing trying to explain what i mean
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