If you need a catalytic converter or you want one for future replacement, I have one that is in perfect shape from a low mileage 2002 boxster S. Fits 00-04 boxster 2.7 and S 3.4. Might fit other models / years of Porsche.
Here is the eBay link.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F14 2969352151