4149 140 0601 STIHL Muffler – Genuine OEM Part4149 140 0601 STIHL Muffler Genuine OEM Part The STIHL Muffler (4149 140 0601) is a genuine OEM exhaust muffler designed for use on select STIHL trimmers, Kombi tools, and long reach hedge trimmers (serial number ranges apply). This muffler is used in the engine exhaust system to reduce noise, direct exhaust flow, and support proper engine performance. Replacing a cracked, damaged, leaking, or clogged muffler helps maintain correct exhaust