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Agreed, I had a 200 cell cat in my Abarth and sounded fine, but with decat they rasp in a very annoying way, as well as being very loud. Peculiarity of that engine and exhaust design. Also I failed the MOT emissions even with a hot 200 cell cat, consensus was that it should have been remapped. Engine not very tolerant, I merrily drilled all the guts out of my MR2 turbo cat and it sailed through emissions.
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@Dammit
200 cell cat will a) pass a standard MOT (when nice and hot) and b) provide very little restriction for a turbo-charged engine. If you were chasing every single horsepower then fine - test pipe/decat. I've got 200 cell cats in my car and (in conjunction with the X-pipe) they made a huge difference to the sound (in a good way).