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To check the cats, you need to plot the O2 sensor voltages. The pre cat voltage should look like a sine wave, the post cat voltage should be close to a straight line. If the post cat voltage starts to look like sine wave, then you have a bad cat.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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