a bit of a look over the dyno sheet will show the 27psi (465kw) run was finished at 6,600rpm and done because the cooler hose kept letting go.
Talking to Adam the car was still making power and on previous runs was still making power over 8,000rpm and believes had he been able rev it to 8,000 on the 27psi run it would have made at least 480kw