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It looks to me like the windstart was a cleaner install on your car though??
Na broski there is a much nicer install with this manifold and it just makes the engine look better all around. Also it is easier to get to some things since it is raised up farther then the windstar.
The reason is flow on the stock manifold us horrible. U have 2 bolts to start then a series of bends, either of those have dyno runs that support 10hp 15 tq.
I don't think anyone has ever just n/a dyno'd an f150 intake, I have an f150 intake but it has an 80mm TB on it that can't come off ;P Maybe I'll buy another and go dyno it to test 0_0!