4180 140 0602 STIHL Muffler – Genuine OEM Part4180 140 0602 STIHL Muffler Genuine OEM Part The STIHL Muffler (4180 140 0602) is a genuine OEM replacement exhaust muffler designed for use on select STIHL professional trimmers, brushcutters, edgers, hedge trimmers, KombiMotor units, and multi task machines. This muffler is a critical engine component that helps reduce exhaust noise, direct exhaust flow safely away from the operator, and support proper engine backpressure for efficient performance.