Hi Tom.
Welcome to the best place for info and help on anything P6 related.
You will be needing the large bore system for your car. "54mm"
I presume it is an auto?,as manuals and auto front pipes are different.
The main down pipe seems to last quite well,and occasionally NOS ones turn up on ebay.
I have a good s/h center box you can have for the cost of p/p.
Good s/h back boxes are difficult to source,took me a while to get one for mine,so I made a straight through big bore 3" stainless tail pipe,sound awesome if you like that extra rumble,,I dont so will be fitting the rear box that took me ages to find,so you might as well have that as well.
Unless you have a mate that can pick it all up from 14m north of Bristol.
Let me know.
I am finally going all stainless,but that wont be happening till Feb,as I have a VW project car I have to get done and sold first.
Dave