That's nothing, that thread over in 4.6L talk is about a Supra doing 900's with only a 67mm turbo. He's going to a 88mm which will bring him to around 1200RWHP, maybe around 1400RWHP on the spray.
Sick stuff.
Now somebody needs to crank out a big single turbo 03 Cobra and give the Supra guys a run for their money.