audi 4000 header pipe 1987
 

Can anyone tell me if the original design on this vehicle was for the header pipe and cat to be a one piece welded assembly. My car has the header pipe welded to the cat (no bolt up flange) and also has the expension pipe to the muffler welded to the cat. The rest of the system is clamp connections. Having a hell of a time finding an aftermarket supplier for that pipe