This is a A-WD47 Muffler (Horizontal) PN: WD47Main Description As Following : A-WD47 Muffler (Horizontal) P.N: WD47 NPTF Pipe Thread Inlet, Fits 1 1/2" PipeDim A (1): A: 1.900" INLET I.D.Dim B (2): B: 2.120" OULET I.D.Dim C (3): C: 4.280" SHELL O.D.Dim D (4): D: 2" OUTLET LENGTHDim E (5): E: 18" OVERALL LENGTH Crossed From: WIS-7 STANLEY MUFFLER Found in Section & Models : Mufflers/Exhaust Pipes > Mufflers, Wisconsin ENGINE: VE4D, Wisconsin ENGINE: VF4D, Wisconsin ENGINE: VH4DM, Wisconsin ENGINE: VP4D Associated Items : New Also This is An Aftermarket Product And : NPTF Pipe Thread Inlet, Fits 1 1/2" Pipe Dim A (1): A: 1.900" INLET I.D. Dim B (2): B: 2.120" OULET I.D. Dim C (3): C: 4.280" SHELL O.D. Dim D (4): D: 2" OUTLET LENGTH Dim E (5): E: 18" OVERALL LENGTH