How do you remove the old catalytic converter.

Look at pic.#5 do u see the weld on the pipe. Youll need a pipe cutter to cut the outer pipe so u can remove it.U put it around the pipe. It clamps around the pipe and has cutting wheels. You clamp it on the pipe past the weld.U tighten the tool and the wheels cut the pipe. Just push to tool back and forth and keep tighting the tool. It will cut the outer pipe. Then u can remove it. Gl