Funny how some shops will claim more power from one ECU to another.
All ECUs will make the same power if the timing,fuel,turbos,intake etc are the same.
Note that its also the only graph not in full shootout mode.
The history of the 581hp car makes it a poor example as its had a few GCG turbos and GT42 cartrage in GCG housings and many engine builds plus 3 different ECUs and a best of low 12s at the drags, tho the Wolf that it was lending has done the fastest GTR pass in WA to date at 10.7.
Still looks like the TO4Z is the best street strip turbo at the moment.