Description Muffler, vertical, round. 2-1/8" inlet ID, 2" bent outlet, 40" overall length, 5-1/2" diameter. Tractors: MF165, MF175, MF180. This item is a suitable alternative for the following: 523394M91, MF-30, 194431M93, MF30, 194431M94, 3.01E+95, A523394M1, 30055E91, A-523394M1, 523484M91, 30055V91