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There is something about excessive noise from the exhaust.
My brother is a MOT'er, but he said that you cant fail it on the noise as there is no way to prove it. In a small closed garage, the noise would be louder than out in the open.
There is a guide on the ZSOC forum, I would suppose its the same principle.
Taken from Tedley;
***Warning*** Modifications shown in this guide are not strictly road legal and involves cutting your wiring loom. I take no responsibility for any damage you do to your car when following this...