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I just posted a post sorta like this but anyway here goes. I just cannot get off the bolts from the stock catalytic converter. I put on some liquid wrench but that did not work. I cant figure it out, help please.

 
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Use PB Blaster, or a torch.

 
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try soaking it in wd 40

 
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borrow or buy an pneumatic wrench

 
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WD40 is not a pentrating oil. It is designed to lubricate and displace water. My personal favorite is Schaffers Penetro 90.

 
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HA... I had the same problem, took me like a year of trying and then finally one day I did it, what i used was a 20$ impact wrench from walmart that plugs in the cigarrette lighter and an impact universal swivel joint so you can get in at a little angle, and spray the hell out of them with PB blaster!!! GOOD LUCK....

 
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Use a gun

 
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For real though, look at it from a different angle. I had a panel in my car that had a clip that just WOULD NOT BUDGE. It took me 6 months to finally get it off, and I looked at it real close to realize that I could get a screwdriver in there and push it out. Your situation is totally different, but think about every possibility.

You need access to air tools man, impact gun is your friend.

 
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WD-40 and a strip bolt kit works just fine, Get the car high and have alot of leverage on the wrench, use a pipe if needed to extend your leverage.

 
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Seriously, WD40 sucks. Its not meant to be a penetrating oil. When you use a true good penetrating oil you'll never use wd40 again. :-)

 
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Yeah.. I pulled so hard that I snapped both bolts right off. That shiet always happens to me. I end up overtightening or I'm too ruff with sheit.

 
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Thanks Guys

 
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PB Blaster... i love the stuff why use one or the other its an exhausts 1500' use both pb blast it and then heat it up it burns for a second but works damn good