4244 140 0606 STIHL Muffler – Genuine OEM Exhaust Assembly Part4244 140 0606 STIHL Muffler Genuine OEM Exhaust Assembly Part The STIHL Muffler (4244 140 0606) is a genuine OEM exhaust component designed for select STIHL backpack blowers and mistblowers, including the BR 430, BR 450, BR 450 C EF, SR 430, and SR 450 models. This muffler is a critical engine part responsible for directing exhaust gases safely away from the cylinder while reducing noise and maintaining proper engine backpressure. Over time, mufflers