"New" back box was a genuine VAG part I got for peanuts, nine years ago as the back box on the car looked scabby then.
Finally, after waiting nine years, the box has great sheets of rusty steel hanging off it, rattling on the bodywork.
But the internal skin is pristine stainless steel,, still leak free.
I should have just cut off the scabby bits and called it good.
The original pipe will still be there in another twenty years, it took long enough to cut through it.
The original exhaust was stunningly well built.
At least compared to the Renaults, Fords & Datsuns of my youth. 3 years tops.