Exhaust for a 2000 A6 V8 Quattro

[TrustyDelux]

Hi all,

I just bought a 2000 A6 V8 Quattro Sport saloon as a project car. It has no exhaust from the manifold Flexi back, and I'm obviously looking to rectify this.

I can't seem to find any off the shelf full exhausts for this car, so was wondering if an exhaust from an S6 or RS6 would fit? If not, what are my options other than getting a custom exhaust made? This is my first project car, so feeling my way through this with a blindfold on lol

Thanks in advance.