I am swapping a B16 From a JDM SiR with PW0 ECU into a 89 Si. Thsi ECU requires 2 O2 sensors in order to run in closed loop correctly(See HONDATA TECH ARTICLE) I want to run a DC Sports Header which has only 1 Sensor bung in the collector. Where should the sensors be installed? Maybe try to match factory locations? DCSports doesn't seem to want me to weld in bungs in the header Primary's and I can't get a good answer why not. Any Ideas?