BennyD
Sea Urchin Pate
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Standard roughly 500 cells per sq inch vs sports 200 cells per sq inch. The 200 cell cats allow much more flow but don't have as much surface area of catalyst to clean the exhaust gases - so MOT may be a bit marginal on emissions. It's not the hardest job to add secondary 200 cell cats to the the system as a worst case MOT failure scenario. The Larini 200 cell cats do look to be a long way from the engine which would make keeping them hot a problem and in turn reduce their efficiency.
Try holding the tail pipe after the run to the MOT centre! They run hot.