I agree, this is a mystery that MMC should be taking very seriously and resolving in conjuction with Quaife.
And, as stated in another thread, there should not be a situation where Quaife refer us to MMC, and MMC refer us to the dealer.
Surely, the first people to know the reason for the unreliabilty / noise must be Quaife (the manufacturers and so called experts) and the dealers would be the last people to know.