Out of the factory exhaust manifolds the 200B item is the one to use. They actually flow better than most off-the-shelf extractors. If you can fit those then that would be your best option if you're wanting to keep it factory-looking.
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green200b - aka Alistair
The fleet:
'80 200B GX - the
green200b - hibernating indefinitiely
'81 RX-7 - 12A extend port, 4.375 LSD - daily (currently hibernating)
'74 RX-2 - 13B bridgeport, 4.444 LSD - cruiser (also hibernating)
Green200B has forgotten more about 200Bs than we will ever know.