If Subaru engineers can design cast exhaust manifolds that flow decent. I don't see why aftermarket engineers can't design a header to do it better.
As mentioned, there were so many early designs of poor quality, it might have given headers somewhat of a bad rap for Subaru's. IMO, creating a quality, well designed header, that actually performs, is a work of art in itself.
Try trolling around on e bays 500+ exhaust auctions for a WRX and see some of the junk people are building to make a buck. The old addage is true. You get what ya pay for.
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