Quoting Boostx:
Any one running one of these cast manifold on a VR4 ?
ERL Performance
Treadstone Performance
Godspeed
ERL Performance, pretty sure the Aussie guys are running some of those. Take a look in the Aussie/New Zealand thread that Curtis started, I think there are some pictures in there. That one looks like a quality piece. Sorry I have no experience with the others.