As far as I know, every saleen there, (with the exception of the black 1990 w/ red decals) was a genuine Saleen. Saleen modifies Mustang GT's (primarily - they do a few cobras, too). Why do they start with the GT instead of the cobra? Ask Steve Saleen, he builds the things.
Oh, and that black/red 1990 "saleen" runs 11s.