So I am still without a precat O2, cant tap the hole and cant get a bung put on since its directly on the cat everyone saying it would be a federal offense to mess with it. Im down to fileing the threads on my new sensor down and the threads inside the cat. Just gonna JB Weld it in. I was told that if I do that it might hold but the heat of the exhaust will melt the jb weld. anyone know if this is true? and anyone have any other suggestions I might try concerning this O2 sensor mess. thanx.
-Eric

 

Thats ture about jb weld. It dosent hold up the the temp. Iv tried this before on my cracked header pipe. It cant take the heat.

 

And a muffler shop won't just weld in another bung? WTF???? The fed wants the O2 sensor in there, and functioning, they don't CARE if it is located in the cat, or an inch or three forward of it.

Find an independent shop, not one of the big chains, and have THEM weld the bung on.

 

are all the bungs the same or do i have to find a specific sized one?

most ones im finding are 18mm x 1.5
http://www.summitracing.com/search/?...2%20bung&dds=1

 

It is my understanding that they are all basically the same.

 

Yup, I second that.

 

im not positive, but when i made the bung for mine, i just cut up a spark plug non fouler and was thining it was 17mm

 

find another muffler shop or weld in your own.
the shops that are not wanting to do this just wanting to sell you a new $200 plus cat.

 

that what i did, alot cheaper plus you get two of them in the pack

 

a federal law? lmao. thats the first time i've ever heard of that. some states don't even require an inspection, so how the hell would they even know? "excuse me sir, do you know why i pulled you over?" no. "i could tell from a ways back your o2 sensor has been fukkered with" . ahahahahaha. you tell them I said they are retarded.