I finally have my Hahn downpipe and I need to have a local shop install a second O2 bung for my AFR. Where EXACTLY should it be placed. If you can paste up a photo of the Hahn downpipe with a mark on it that would be great.
Ps. I don't need you to tell me that it needs to be placed before the CAT.

thanks

 

i beleave 12-18 inches from the beginning of the header...

 

clearly you didn't read my post