I bought this second hand, and think its a turbonetics manifold but can't say for sure.
It appears to be a pretty good quality manifold but I never got to use it because of fitment issues. If you use this manifold you may have to alter or remove your front motor mount, depending on the size of your turbo. Also it is pre drilled/threaded for an EGT sensor on the bottom, however if you dont have an EGT sensor you could just plug it or weld it shut.
For T3 flange
$170 OBO