My cat-back exhaust is on its way so i thought i would prep the car so its ready to go. So much for that idea, here is what i ran into. Question is are those studs part of that flange on the cat? I cant think of any way to get them off without cuting. There is really no thread on the nuts...they are covered in a rust. I can get a wrench around it but it doesnt do anything. The expander for the 2.5-3.0 inch has to go on here. Any help? (sorry the pics are so big)

 

Damn i dont think ive ever seen one that bad. This might sound funny but take a blow torch tothe bolts. I hada similar problem with my car when i was having a test pipe made and that is how they finally manged to get the bolts out.

 

A lot of heat and a lot of WD-40. And, if you are any good in chemistry, brew up some phosphoric acid. That dissolves rust well.

 

Yippeeeee, i cant wait.
1) I don't have a torch
2) Ill get right on brewing some phosphoric...
I had my dad look at it and he wanted to cut them[&:]. I'm not buying a new cat either.

 

Just make sure you have a decent concentration of it

 

I actually was being sarcastic. I dont have the slightest clue where to begin, but Google here i come. Just pour it over the nut?

 

Ergh lol.

Yeah pouring it over it will help to a degree. What is going to be most effective is if you can keep it submerged in it. Be careful, it will dissolve iron, but it dissolves rust a LOT faster. You will find that some household cleaners contain the stuff.

 

I think i found a more "safe" way.... "Naval jelly"?

 

uuuhh....chemical composition?

 

well yes but its not like using straight up phosphoric