The WRC cars have huge gaping holes in the bonnet where the road cars have little blanked-off grills. Some owners have removed the blanking plates and reported an improvement - in noise if nothing else!
A possible disadvantage to the removal of the blanking plates is the creation of hot-spots under the vents when the car is stationary with a hot engine. Also some of the electrics pass directly underneath these vents and it may be wise to add some extra protection to connectors etc. thus exposed.
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