This is late reply. Yes both were new Sti's. My wife noticed it then I took a closer look. I have read on other sites that the gold flake sometime dosn't show up in the black. I thinking it was either special order or done by the dealer....
The manual says blue and black have "mica", which means there's colored flakes in the paint. There's only one black for the STi.
I don't see the flakes in my paint, but maybe they're blue or something.
My wife bought one of the first STI's (Black) in Colorado, and the first one delivered at the John Elway Subaru dealership in Golden.
In the shade/at night, it just looks Black. But the first time we saw it in
bright sun . . . the gold flecks under the surface are really obvious.
We haven't seen another black 2004 STI yet to know if they all look
that way, but we both agree it looks way cool. Can't say she would have
ordered it that way on purpose, but since that's the way it came, it ain't bad.
She, like Henry Ford, says "you can paint her cars any color you want,
as long as it's black."