Muffler / Briggs & Stratton 391569SPack Size:1Briggs & Stratton 391569, Briggs & Stratton 299477, Briggs & Stratton 391569SEdgewater 434710, ESF 157-063, Foley/Belsaw 5977016, Foley/PLP 157-063, Laser L3042, NHC 255-4233, Oregon 35-026, Sunbelt SB-859SBriggs & Stratton 251412, 251416, 254422, 254427 and 283702OD: 4 1/8 ", Length: 7 7/8 ", Pipe Thread: 1 ", 4 3/4" pipe length