I just installed an MP plenum and noticed I have no way to connect (what I believe to be) the O2 sensor. I have headers and on the drivers side there is a threaded connection where a rigid pipe plugs into the stock plenum pipe. No thread or anything on the interface, they just seat into one another, then a plastic plug for the wire harness connection. Anybody out there know how to handle this issue? If i don't plug it, it is an exhaust leak, if I do plug it will I have an error code due to the sensor not sensing? Any help/coaching would be appreciated.