Short answer was its worth extending the warranty since replacing the gearbox or turbos is mega $$$ on the labour charge alone (I dont have a UK pound sign on my keyboard over here in Septic Tank land)
I asked the obvious questions surrounding gearbox failures and turbo failures and would Audi cover these parts despite the modifications.
Service Dept stated that YES, Audi would honour the extended warrnatry but only replace the failed item with a std part. Hence if the turbos were non standard and went, Audi will only replace them with Standard ones
We'll see nearer the time if they will put this in writing; though I have no reason to believe they wont stand by this. SKF have always been 100% in terms of customer service and knowledge of RS's
On another point, when its due a service they wont touch the brakes because they're non standard ????? Is that normal procedure?
and is there anywhere in the NW that can undertake this other than QST in Haywards Heath....4.5hrs away???