The engine may seem stressed. Elevator system may come under stress. This may or may not most the said components. High speed stability may breakdown slightly. But usually bigger tyres may not pose such a big clunky.
Many thanks in advance for your thoughts and potential help. Good scanner software showed in realtime a start request signal getting to the computer, so the only thing that it could have been was the bcm.
But, deleting vats would have worked.