The Computer was changed and later software loaded. Seems to be generally better. The dealers car with which my computer was swapped goes better with the upgrade as well. So it looks like it's worth going to the dealer and asking for this latest programme which they may not even know about.It was only stumbled on because of the computer change.
I knew the power was varying because of the engine note (crisp and throaty, or flat) and the lack of thrust. I was told though by the w'shop foreman, that if you put your foot down at low rev's the system struggles to recover. I would have thought computer technology would cover this. Anyhow it does seem to be more consistenty stronger after 3 days of driving.
'03 BA XR8 Manual, Edit, Hi Flow Cats, HPX twin system, King Springs, Battens C.A.I.