AGU Exhaust Question

[WorkInProgress]

I've done a quick search of the forum but can't seem to find a definitive answer.

I'm looking to get a stainless steel exhaust for my '99 1.8t Sport, I've got a DP from EBay, 2.5", would I just get the exhaust guys to make the cat-back in 2.5" also?

 

[Prawn]

2.5'' will be fine for a cat back on an AGU, don't be convinced to have it done in anything smaller though.