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What you're looking at is a different intake manifold with different length runners, different cams and to a lesser extent headers. You have to understand though that to close that hole you are going to be taking power from somewhere else. This isn't a 1:1 kind of thing but ultimately the parts have been designed to have maximum efficiency at a certain point in the rev range so to improve the efficiency in a different point you are going to gurt it somewhere else. What I would expect to see is some cams and probably new intake manifold which will be optimised for mid to high range so will fill the hole but also knock off the peak from 2000 - 3000rpm.
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