OEM replacement muffler assembly from Stihl. OEM mufflers are a high quality replacement option for your chainsaw. Mufflers take a beating over time, and sooner or later you will need to replace it. Whether it is rusted out, dented in, or you want to do your own woods port, Bailey's is your source. This muffler comes with a spark arresting screen, and has been approved by the USDA, so it can be used on federal lands (BLM, USFS), as long as it is not modified.