I went to remove my Catalytic Converter and it looks like the two rear nuts and bolts are welded on. The two front bolts broke loose and are fine.

Is this possible and / or normal?

Could it be from rust and corrosion making it just appear welded?

I don’t want to cut it off & then get it welded back unless I have too.

Any help would be appreciated.

 

Stock converter is bolted on front and rear. The bolts and nuts usually rust on, so break them loose. I replaced mine with stainless steel hardware and they work fine.

 

Unless there is a reason to suspect that something was done, before, then you are probably just dealing with severe corrosion.

You can try PB Blaster and such, but if the nuts and bolts are that far gone, I would just cut the bolt heads off, drive the remains out, and remove the cat. Just get new bolts all the way around for the new cat. You might also want to look into some kind of security for the new cat, since cat thefts are happening all over the country. Be sure to get you old cat recycled, since there is some coin to be regained by doing it.

 

If you bought the truck used, the previous owner may have welded the nuts to prevent theft.
Use a saw-all and cut behind it.

 

Just cut the old bolts/nuts off, dont cut the exhaust.

 

or do what i did and cut the cat out sell it for 150 bucks and go buy a straight pip and weld it in works really good for me just find a city that dont do emissions and reregister it there no need for the dmv to know just email me and ill explaine everything man if you wanna know that is