To Cat or not to Cat, that is the question

[chimi]

My Sag is due it’s MOT. I acquired the car two years ago and when MOT’ing it last year discovered it had the cats removed by the previous owner. Local specialist got it to PASS ok . I did get feedback that it was running a little rich. I am not a mechanic so use professionals for whatever needs doing (apart from unblocking my windscreen washer jets).

Anyhow, question is; Should I stick with de-cat setup or invest in cats? What about a completely new exhaust setup to get a few extra hip etc.

I would welcome views from people who have experience of both set ups.