This is a A-EE418 Exhaust Extension PN: EE418Main Description As Following : A-EE418 Exhaust Extension P.N: EE418 Includes CL412 Inlet ClampDim A (1): 4 1/8" INSIDE DIAMETERDim B (2): 20 1/2" OVERALL LENGTH Crossed From: EE-12 STANLEY MUFFLER , 79023427 ALLIS-CHALMERS , 79023427V AGCO Found in Section & Models : Mufflers/Exhaust Pipes > Exhaust Pipes, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Includes CL412 Inlet Clamp Dim A (1): 4 1/8" INSIDE DIAMETER Dim B (2): 20 1/2" OVERALL LENGTH