Excuse the picture quality...
HKS Twin Turbo Manifold on the side of my parts engine...gives a good idea where the turbos end up...the manifold belongs to a friend.
YSR Twin Turbo Manifold (Still not completely sure on it being a YSR, but the source was reputible, though there are no markings to be sure) Greddy style twin turbo manifold (differences from the Greddy include how tall the runners are and the routing of the #5 and #6 runners, as well as some difference in turbo placement)
on my old parts car...
I also have the Greddy twin kit with manifold...but it's waiting for me to pick it up next week, so no pics yet. Given the notches for hte power steering on the Greddy and the YSR, I suspect they were originally designed for the MKII, then carried on for the MKIII when they realized Toyota kept almost everything the same.