looking at this turbo, seems like its well and truly got APRs big turbo kit covered and any other Garrett Turbo based kit. One f the guys on VAGOC, S3Alex, has a GT3071 kit with REVO software and he's only around 480hp!!
So this turbo is GT30 territory which is mighty impressive, even if, assuming its a generous dyno, overreading by 10%, it would still give 450hp!!