[vonsmog]

You could cut just one side, remove a bit at the cut, and then with a portable pipe bender, take out the hump. Then just have someone reweld and all will be good again. Only issue I see it that the center pipe is angled up where it is welded to the side pipes. So to be perfect, I would just cut it out and weld in a new straight one. This would be the fastest way to do it and have it look right.