Like the quote from the site.
Those pieces are Ford Production IMRC plates removed from the assembly line before the final stages of machining for the butterflies is done.
They are just as good as the billet ones, in fact the tolerances are Ford so they are probably better than the billet.
Steeda did the billet ones first, Ford Racing pulled these off the line and put them in the catalog, Steeda got cranky with the whole patent thing, then told Ford Racing that if they want to sell them it must be sold through Steeda or not sell them at all, Pretty simple really.
Anyone on this board will make as much power with these as they would with the billet ones, in fact I would bet that back to back there are no if not negligible power differences.