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These have two functions - to stop you swamping the engine in deep puddles and heavy rain also allow additional air flow.
As I have tested temps, in front of the OEM air filter feed pipes by the radiator, in the air box and in the engine bay, you will gain nothing from blanking them - also turbo cars are not as IAT sensitive as NA cars.
Scoops and blanking the air box will do nothing for these engines, changing to a dual cone filter set up will help spool up time and gin some performance once you tune the engine but only in the region of 10 bhp which you won't be able to feel or measure against a stop watch- does get you a bit of turbo spool / induction noise though which might make it worth your investment...
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