im trying to instal a header and i can't undo the nut's that connect the catilic convertor to the header i've tried de ursting it heating it up and everything and then the impact wrence still can't budge it any suggestions

 

Keep trying, those bolts are a major pain in the ass to take off, even with an impact wrench

 

we gave up nothing has enough torque to turn them so were gonna take it to a muffler shop

 

do it by hand, it might take a while but its less expensive than taking it in.

let some WD-40 soke for a couple of minutes and then try.

 

Cut them with a hacksaw. Replacement spring bolts are about 10-15 bucks from the dealer. It's not worth the trouble, and they're generally worthless for reinstallation due to the torsional forces bending the bolts.

When you install new ones, I suggest using Nickel-EZ to inhibit the corrosion that sets in and causes them to be a pain to disassemble.

 

use a propane torch on them after soaking in WD-40 for a bit..the expansion would help loosen the rust buildup.. but BE CAREFUL with melting or damaging other parts...

 

All you need is leverage. Slide a pipe over the ratchet and you're good to go.

 

Hacksaw. It takes some time, but it works quite well.

 

**** WD40, use some PB Blaster. That stuff will break anything loose if you let it penetrate long enough. Spray them with that and then drive the car to heat up the exhaust. Jack the car back up and spray on some more. Use your legs and a long breaker bar to break them free. Heck even if I didn't break the nuts loose I could break the bolts in half if I used my legs. I have strong legs, though.

 

I have absolutely no faith in most exhaust bolts, I got lucky with my current car (florida car = no rusty exhaust)

I'm strong enough to where if my arm and a breaker bar doesn't move it, the nut/bolt will round. I've been through this many a time, and it allways came down to a hacksaw or a saws-all. It takes time, but it works.