I recently had to repair the exhaust on my Piaggio Scooter. It was becoming increasingly noisy as holes developed in the exhaust silencer box. I first had to remove the exhaust manifold and unbolt the silencer box.
Once this had been removed the full extent of the problem was there to behold. The exhaust had rusted through in several places. I would first have to cut the rusted sections out using a Grinder and then replace them with Stainless Steel plating.