Just been there. Basically mine had welded themselves in after 15 years of heat cycling. I had the cats out and got one out but stripped threads.
Took them to an exhaust builder to cut out the existing ones and weld in new stainless steel bungs so I can install new O2 sensors.
Detailed thread on the Irish Porsche club forum so will add link to that so you can see all the info.
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Threaded Mode
