major cause of muffler deterioration, while repeated heating and cooling can also put stress on its metal components. A muffler lives through constant heat cycling, scorching hot on a highway run, then cooling down in the driveway. Over time, repeated expansion and contraction can put additional stress on the muffler’s metal components.
Moisture makes it worse. Condensation collects inside the exhaust, especially on short trips where the system never gets hot enough to burn it off. Moisture trapped inside the exhaust can contribute to internal corrosion, while road salt can
