Got an exhaust and noticed it had an O2 bung after the resonator. I dont have an o2 sensor on my car to plug into it so is there some sort of plug or bolt I can put in?

 

I would take it to a muffler shop and have them weld a small metal disc over the opening. Well, I would do that myself atually, but a muffler shop or general mechanic could do it easily. There's plenty of good thick metal on the bung to weld to.

 

No, i dont want to weld anything....that just asks for rust. Are there any screws or anything?

 

just screw in a old o2 sensor and that will be the plug, if you dont have an extra sensor go to a shop and ask for a broken one for free

 

No one makes a bolt or anything? What is the size of the threads....ill just try Lowes or Home Depot