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OK so i got a new exhaust. I go the rear end off but now i'm trying to get the intermediate pipe and hte resonator off. However, the 3 bolts attached to the catalytic convertor so very very rusty. I WD-40'd them. I tried my hardest to get them off with sockets and all sorts of things. I even broke one of my extension pieces. What should i do how should i get these damn things off. I am going tommorro wto get new nuts that are stainless so i can just replace these ones. I'm stuck here and can use any advice. WD-40 not good enough?

 
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If you want help I suggest you change your topic heading. No one is even gonna look if you have it say "rusty nuts please help." My guess is you'll have to cut em.

 
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sounds like a personal problem

 
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Liquid Wrench, spray them good, then leave it overnight, try in the morning.

 
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boilermaker what do u mean liquid wrench?

 
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liquid wrench lubricant spray.

Or if you have a butane torch, heat the bolt up till its red, then quickly lossen it with a ratchet. it works!

 
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if i heat the nut up till its red, then the bolt with the threads on it will get hot to wont it? i dont want to bend it....

 
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torch it til its glowing..
let it cool off a little.. then try it

 
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Schaffers Penetro 90.

 
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take an impact wrench to it.

 
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that doesnt always work on rusted nuts and bolts... trust someone who has to deal with that stuff..
it might work.. altho it could also round off the nuts, or break the studs on the catalytic converter

 
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WD40 is a great water displacer, but not a great lubricant.

If the liquid wrench doesn't do it and the heating doesn't do it, try freezing it with canned spray or a shot off a nitrous bottle.

 
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Metal Expands when it heated, so someone is going to have to explain that one to me.

Also I used that same PB stuff in Thoughthards picture when I had the Same problem on an older car. Didn't work too good. My car was like 7 years old at the time, not 2-3 so it might work well on his though.

My Advice is This:
1. Cut the head of the nut off with a hack saw blade (yes it is a LOT of cutting)
2. Sand down that area good (a lot of times it is the rust between the head and the flat part that cuases the trouble)
3. You have to have a stripped head bolt remover kit from Home Depot.
I don't know the technical name but the steps for removing the bolt with no head are:
1. Drill a pilot hole (size listed)
2. Insert the special thread piece and turn counter-clockwise
3. As the peice turn it gets deeper in the pilot hole, tightens in the bolts and turn the bolt out.

It's worked for me in the past.

 
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Jacks, the heating/cooling works becuase the two pieces can expand/contract at different rates. This sometimes creates enough play to free it up.

 
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Ooohhhh Okay.. I guess that makes some sense

 
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UPDATE......
i ended up heating the bolts up with a propane torch, and even while one wuz stripped bad from a previous day work of trying to get it off....i poped a socket over it and just heaved and it loosend right up.....also keep in mind ...today i took it to my girlfriends dads shop and put it on a lift..so i had much better leverage too, but thanks for everyones ideas....the heat one worked and the exhaust sounds great and gave me a little high end power.

 
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Well I'll be a Monkey

Goodjob bro

 
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cool beans! i learned tricks like that from working at my uncles car garage over the summer!

HOW BOUT ADDING TO MY REPUTATION POINTS? :O)

 
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lots of pb blaster. then put an open ended wrench on it.. and proceed to kick.. or push very hard with your foot. you'll definetly braek it loose.