Hook your car up to a Durametric and plot the voltages of the pre and after cat O2 sensors. The pre-cat sensor should be almost a sine wave form, the after cat should be almost a straight line. If not, then its likely the cat is bad.
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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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