Downpipe designed for: Opel Astra H 1.9CDTI 150HP (Z19DTH) Opel Vectra C 1.9CDTI 150HP (Z19DTH) Opel Signum 1.9CDTI 150HP (Z19DTH) TurboWorks downpipe is made of 100% stainless steel. Inlet diameter (internal): 51mm Outlet diameter (internal): 49mm Outlet diameter (external): 55mm It is also possible to mount the 120HP (Z19DT) version, but requires welding the sleeve for the EGT sensor, and adding a mounting for the heat shield. is in the photo in the gallery. & nbsp