Pretty sure they will be getting close if not max'd, although not personally pushed the Sti pinks that far on a 2.0ltr.
There is alot of debate as to what the actual flow of the STi pinks are, some say 500, others 520, 550 etc....depends what you read, you get the idea.
IIRC the flow scale in the map is about 568cc. We max'd them on Nige's 2.5 with 20G
What Turbo are you using as standard VF won't achieve 400 ???
If you want to stick with the standard fuel delivery method then use
http://lateralperformance.co.uk/prod...pressure_gauge
If you want parrallel fuel rails then use the 3-port variant of the above, a Y-piece and equal lengths of fuel hose to the 2 the fuel rails.