This is a A-EE400 Exhaust Extension PN: EE400Main Description As Following : A-EE400 Exhaust Extension P.N: EE400 Includes CL400 Inlet ClampDim A (1): 4" INSIDE DIAMETERDim B (2): 20 1/2" OVERALL LENGTH Crossed From: EE-11 STANLEY MUFFLER , 79023426 ALLIS-CHALMERS , 79023426V AGCO Found in Section & Models : Mufflers/Exhaust Pipes > Exhaust Pipes, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Includes CL400 Inlet Clamp Dim A (1): 4" INSIDE DIAMETER Dim B (2): 20 1/2" OVERALL LENGTH