Y-Pipe Opel/Vauxhall Z16XER, A16XER, Z18XER, A18XER from catalytic converter to first silencer

Gruppe A downpipe from catalytic converter to first silencer
in 2,5" (63,5mm) build of stainless steel

Opel/Vauxhall Astra H / Zafira B
with engine Z16XER, A16XER, Z18XER, A18XER

Please state car type

Please specify the diameter from entering the silencer
(some manufacturers have 2.5" systems but with a smaller entrance).