With only 276ft/lb's this would be impossible. Even at 5800 it would be at a push, i'd guess peak torque at 4800 peak power at 6300.

I was just going to say is this on a GT30, they always make VERY good power at low boost levels.

Out of interest, surely you tried it on a higher boost level?

Was it purely because the fan's were small you didn't push harder, did you monitor AIT etc?