Well I know the owner of these cars and I also know the one who rebuild the blue one.
the black '90 gt-x has a standard gt-x bumper with gt-r hood.
the blue one is a gt-s; fwd turbo, completely rebuild with mitsu. turbo it has aprox 200 bhp. the bumper is a if I'm not mistaken an original customized jdm bumper, and he also customized the hood.