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Piwoslaw,
This has been done before by a few folks. One guy had a scoop molded into his hood to direct air down over a second stock inter-cooler. But he didn't keep it that way for long... I think the additional cooling benefit is partially diminished by the extra pressure drop you get in the system. Having one larger intercooler definitely seems like the way to go.
Some cars, like the Audi TT, split the charged air coming from a single turbo in a y-pipe and send it to both sides of the bumper for dual, parallel intercoolers. This seems like a lot of extra piping volume to me... But the pressure drop is probably lower.
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