Hi there

I have 85000 km on the clock and for the last 18 months the engine warning light came on , went off, but now it is on all the time. When I have the car serviced at 63000 km the feedback was the error code was catalytic converter. Since that time the car is not idling as smoothly as it used to but still runs very well at higher rev. I believe the car has 3 CC , 2 small ones near the manifolds and 1 larger

I was thinking of getting it serviced and tuned, but wonder if I should replace the catalytic converters, Any aftermarket brand that are well regarded. Another thought was I could add extractors get rid of the 2 small cc and just have one main CC ?
Are extractors a benefit to performance and economy. I do not wish to make the exhaust noise much more noticeable

Any suggestions?

have a good day

Kevin