Yeah its probably best to shroud it in something.
The manifolds don't actually get as hot as some components as it already has the black covers on them. (next time you've been for a drive just check them... you can usually touch them without burns no probs.)
I'd worry more about getting bad heat-soak, as i'm pretty sure the way it is now is drawing in a fair amount of heat, need something similar to Fleds setup. Or a K&N Apollo if you wanna spend the big bucks.
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