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I have bought the scoops, not to increase power - but to do whatever I can to displace some of the hot air under the hood that my intake is sucking in. Even if this results in lowing AITs by as little as 1 degree, that is good enough for me (with low ambient temps in the UK I would think this is feasible). Empirical testing may or may not support this, but from what information I have available to me, it may help strike a balance between increased air flow, lower AITs and preserving the longevity of my turbos.
I realise that they do physically restrict the opening to the radiator - but don't see how they restrict actual air flow to the radiator unless a vacuum is formed between the scoops and the radiator. I would have thought that air flows beneath and behind the scoops and then into the radiator - there may be a little more turbulent air entering the top portion of the radiator, but that is about it.
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