I need an extra O2 bung welded on my exhaust and was wondering where I can buy one and what size it has to be. It will be for a wideband O2 sensor for a custom tune. Can I buy one from an exhaust shop or does one have to be custom made? Thanks!

 

If you want a nice stainless one to match your stainless exhaust, get this one from Forced Performance. It comes notched already.

http://linux.forcedperformance.net/m...Code=UNIV-GSFL

If you want to do it cheaply, you can get a M18x1.5 nut and weld it to your exhaust.