I have had problems with the MOT on my 4/4 for the past 3 years!
My friendly MOT tester has to stuff a rag in the exhaust to get it to pass!
I've no idea whats going on, I have a sports exhaust and it's always been a problem.
He says it doesn't have enough back pressure?
If i ever have to change MOT testers I might have to stuff the rag in just before I arrive
