Its quite hard to chip an r33, the chip that stores the maps is also the microprocessor for the ecu. My suggestion's would be:
full turbo back exhaust
bleed valve set to around 10-12psi
powerfc or wolf3d ecu
That would have you up and around 250-270hp, depending on the dyno which would make for an entertaining ride. A bonus of the wolf3d over the powerfc is that it has boost control built in, so you can do it more reliably than the bleed valve.