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I have some long tube headers and mid pipes. There is one bung hole on each header and watch mid, total of 4 holes.

It is my understanding that there are only 2 o2 sensors in the exhaust. So I have a couple questions.

1. Can anyone confirm how many of the 4 holes I will use when I swap these parts out?

2. How can I seal up the unused bung holes?

3. I am installing a wideband a/f gauge. I am guessing I can use one of the extra holes for the new o2 sensor.

4. If all 4 holes need to be used by the stock sensors, where should the new bung hole be placed for the wideband o2 sensor?


Thanks.


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Assuming it is a V8, you will have four O2 sensors. Two pre cats and two post cats. If you have either high flow cats or deleted them completely you will need to have the rear O2 sensors turned off or you will most likely throw a MIL. You can use the rear holes for wideband but it will not be 100 percent accurate. The best thing to do is get new bungs welded in right after the collectors and on a 45 degree angle so no water can get to the sensor
 
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