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The Explorer and GT40 intakes have smaller cross-sectional dimensions than the 5.0L EFI truck intake. Ford in their infinite wisdom blessed this vintage 5.0L truck engine with a very generous intake. At the same time they strangled the 5.8L engine beyond belief. Perhaps they were trying to atone for their mistakes with the GT40 and Explorer intakes....
All stock the Explorer intake flows a little less than the 5.0 Truck intake but both of them flow a ton more air than any stock 5.0 motor can move so you won't likely see any difference from this swap.