Any good or not
Discussion
The air that is drawn in should be cool for efficiency.
When you are tootling along the temperature in the engine bay is enormous and it is better to help keep the inlet as cool as possible, hence insulate it.
It speed it doesn't matter as the air rushing around the engine compartment will be much cooler and at higher RPMs the speed at which the air is consumed overrides the speed at which it can be warmed up.
Better to insulate IMHO.
When you are tootling along the temperature in the engine bay is enormous and it is better to help keep the inlet as cool as possible, hence insulate it.
It speed it doesn't matter as the air rushing around the engine compartment will be much cooler and at higher RPMs the speed at which the air is consumed overrides the speed at which it can be warmed up.
Better to insulate IMHO.
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