Put my 156 V6 in for the MOT early last week, after spending loads on all the front suspension, new stainless back box etc etc. It failed on the co2 reading being too high. I was happy with that, so next day rang round for a quote for a new cat. The place that did the MOT could get one for £240....and why i rang kwikfit i don't know!! Several parts places don't stock them, ebay ones i won' trust, and no internet company could do under £180
Kwikfit - £287
Elite tyres and exhausts - £195
ATS euromaster - £ 80
guess which one i went for today, and low and behold mot passed!! I am now a happy bloke, even the chap at ATS said he had to ring his suplyer twice to check the price, so if your cat needs replacing go to them!!