How to disconnect exhaust slip flange?

[sweefu]

Sorry about the title, not sure what to call it. I have an exhaust for my skyline which is live axle, the exhaust goes over the diff. There is a 'slip flange' on the exhaust so you can take the rear muffler off, put it over the diff and then re connect it. I can't seem to get the exhaust to come apart though, pictures are below. I have tried heating it but I only have a small butane torch. Would a big oxy torch get it apart? Or how should i do it?
Cheers.

[ari666]

hit it? .

[sweefu]

Tried that, didn't want to wreck it. I can only think of heating it up / pulling / hitting .. Does anyone have a trick ?

[ari666]

yeah hit it. LOL.

so i assume it used to have a U bolt on it right? so whats happened is the U bolt has squished the outer exhaust pipe onto the inner, and rust is holding it there. get a metal hammer and hit it all the way around on the bit where the u bolt has squished, and itll start to wriggle free. then hit it more and twist the two pipes apart.

edit* you have to be pretty brutal. but what you are trying to do is use the inner pipe to make the outer flat again... make sense?

[neet_wagon]

Bust it wide open like a cheerleader

Get a screwdriver to separate the two halves. You can *massage* it back into shape once you have it off.

[sweefu]

Twist was the winner! Cheers for the help, you all did a lot better than my local exhaust shop!