i dunno the obd, how do i tell? according to that down there its a odb-none. its a pw0 ecu. i cannot find anything on hasports site. im gonna do a google search, but if you happen to have a link on the hasport site post it up. i am still confused as to what to do. should i just weld another bung right next to the other, should i put one after the cat, i found this http://coreyonline.tripod.com/o2mod.html , then i have foudn this

"As for O2 placement, no U.S. B16A header has proper O2 placement. 85-91 fuel injected Hondas (OBD-none) use an unheated single wire O2 sensor that should be mounted within 10-12 inches of the exhaust port. The O2 sensors need to be heated by the exhaust gases to give an accurate reading. The stock 89-91 (OBD-none) B16A ECU uses two single wire O2 sensors, one in the collector of cylinders 2 and 3 and one in the collector of cylinders 1 and 4. I also believe the Primary O2 gets greater weight in the determination of the overall fuel mixture of the engine. This would explain why the common practice of switching the O2 sensors when a B16 experiences partial throttle roughness works. Switching should actually cause a problem if both O2s are working properly.",

or should i do like what i found another header with: