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I think if you are in doubts regarding your mechanics' judgement, you have two choices: you ask for a second opinion, or you do your own diagnostics. Diagnostics can easily be done with a Foxwell or Durametric tool, you can plot the O2 sensor voltage signal of all the four O2 sensors real time. This way you can have a pretty good idea about the efficiency of your cats. Without doing this all you can do is guessing. A Foxwell tool is ~ $150, a Durametric is more expensive, both can do the job. The other thing you need to invest is effort and time, to read some related articles and understand what to look for and how to interpret the results. Luckily, you can find all the help needed on this very forum, to do your own diagnostics. My two cents' worth.
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Boxster
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