So my 91 olds ciera has been long overdue for changing the exhaust as it has a ton of holes in it and i went to try to take the pipe off right after the cat and its incredibly rusted. What is the best way to try to get the pipe off? It looks like the bolt threads into the flange so if i cut off the head of the bolt will i be able to then get the pipe off? i figure if that works ill have to drill out the rest of the bolt still stuck in there. I cant seem to think of any other way to go about it...any ideas?