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the skinny O2 bung can also be removed i believe its an 1" wrench or something like that and the remaining hole is i believe the proper size for the big O2. or dont run any o2 sensor b/c its not gonna compensate on the ka ecu for any of that jazz.. you should be running an afc / wideband at the very least. if you remove the o2 you have less of a chance of the ecu pulling/adding fuel and you control everyhting.
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