; HomeHeavy Duty Truck PartsExhaust SystemsMufflersCumminsM11 / ISM 10.8Used 2009 Cummins M11 / ISM 10.8 Muffler Used 2009 Cummins M11 / ISM 10.8 Muffler Unfortunately this part is temporarily unavailable. View other Cummins M11 / ISM 10.8 Mufflers