I've dealt with nuts that were so rusted on, it was as good as welded on.
The simplest and fastest solution isget a rotary tool, acutting wheel holder, and acouple heavy-duty cutting wheels. Cut the bolt and nut off. Get new ones to replace it.
It will cost you to buy a rotary tool and accesories but will save you time and energy, which you've already spent. I went through the same thing as you.

 

yeah dude it's called an "o2 Bung", no biggie...

Like mentioned above, the cutting wheel is your friend.

 

yea just cut it off with a hacksaw in between the exhaust mani and the cat or whatever you are cutting it and go buy a new bolt. Itd be real cheap and save you alot of time, thats what i did and it worked just fine.

 

VA YA CON CORNHOLIO! would you like a spatula, spatula for your bungholea

 

oh man hahahahahhahaha come on Tim, this guy really needs some help


bung hole.....

 

Sorry, i got a little carried away

i agree, you will either need the use of torchs' and heal the sumbitch up, or you will have to cut it off. And even if you get a new cat converter, you still need to get the bolt out. so i would focous on that first

 

Hacksaw is not always easy to get the right angle to cut the bolt (especially if the bolt is above the pipe at the 12 o'clock position) and it takes longer.

Even if you go with a new catalytic converter, you'll need to deal with bolts that hold the cat to the exhaust manifold down pipe. Same old situation.

 

Bastards


Anyways, thats for the suggestions.

 

lil dremel will cut that sucker off in no time. just buy a new bolt and ur good to good.

 

^^agreed