A quick test for those simptoms and to find out wheter it is the CAT or not is to disconnect the exhaust somewhere between the motor and the CAT.
Crank it up and nail the throttle to see if the "peppyness" is restored.
If nothing else the neighbours will be very impressed....
You will be able to tell if there is difference in one punch of the throttle in neutral. That's how we do it in the shop if in doubt.
Barna
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