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on a test pipe do you mount the 2nd O2 sensor ou do you leave it off or what??????
Depends...OBDI won't have the second sensor. OBDII will have the second sensor, so it's best to buy a test pipe with an O2 bung. If you don't, you'll have to leave it unplugged and you will get a check engine light. If you converted to an OBDI ECU, that would get rid of it though.