ownz

So, I've searched for days and in multiple forums and even went to the dealer and can't find an answer. There is a threaded hole on my stock downpipe that is really close to the steering column. It actually faces almost directly at it. I thought at first it was for an o2 sensor but when I tried to plug one in, the hole was too large. I've seen this hole welded shut as well. I will post a picture when I can lift the car back up. But does anybody know what goes in there or if I can just plug it up. If you know the size of the plug that would save me as well.

Thanks in Advance.

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