A storm in a teacup as usual.
MOT testers have had the power to fail a car deemed to be excessively noisey for donkeys' years. This isnt a new idea.
Our MOT chaps are yet to hear of most of the the nonsense quoted above.
Take a chill pill and stop worrying

BTW when is the last time a rozzer asked for a producer based on you having no cat installed?
That said I dont have to worry, I work at a car spares/garage/mot test station
