Hi I have searched the forms but couldn't find an answer, I am putting a pace setter header and high flow cat and cat back my question is what do I do about the second o2 sensor behind the cat? Do I cut and use the original pipe or make a new one and weld in a nut to thread the o2 sensor into or can I buy a 2.25 pipe with o2 sensor thread in it . I don't want to use the original pipe because I am putting all 2.25 piping your help would be appreciated thanks.

Most muffler shops will weld that bung on for like $10.

Drill a hole and weld in an O2 bung behind the catalytic converter.


2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero

Thx for the help.

get a little jpipe, its a little piece of j shaped pipe that the o2 sensor screws into and then the end of it gets welded to the 2.25' pipe and you have to cut a hole for it too

arthur Pietrzak wrote:get a little jpipe, its a little piece of j shaped pipe that the o2 sensor screws into and then the end of it gets welded to the 2.25' pipe and you have to cut a hole for it too

What?

arthur Pietrzak wrote:get a little jpipe, its a little piece of j shaped pipe that the o2 sensor screws into and then the end of it gets welded to the 2.25' pipe and you have to cut a hole for it too

Thanks for the help I am not sure what you mean by j pipe? Another quick question are all O2 bungs the same thread ?

Should be.

When i built my 3in exhaust. I just cut the bung it self out of my old exhaust and welded it to my new


I Love My J ♡

cody nobbs wrote:When i built my 3in exhaust. I just cut the bung it self out of my old exhaust and welded it to my new

Ok ill just do that thanks for the help.