I have a 98 a4 Avant wagon The pipe broke about a foot and a half back from the catilitic. I will add that it looks like a very strate cut. I am thinking of useing a taperd pipe adapter and clamps. But I did not get the specs be for I left.

 

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Not sure what you want to know. If you are going to have to cut and use adapters, then what measurements would work? It sounds like you will be making a custom tail system.