The shop where I have work done has said that he has replaced factory cats in two boxsters, one with 50k, the other with 60K for what thats worth.
I wonder what happens to our cars when they are taken to reputable shops. I left my car at probably the best place in town with a good reputation for doing work work for the Porsche dealership. I left it there to have the plastic rear window replaced.
They did a great job on the window, but it sure seems like there is more play in my new clutch that I have been babying since I got the car back. I did not think to check the milage before I dropped it off, and I am not sure, but I suspect someone gave my car a hard test drive or two while they had it.
Ed