Hey mate, i'd go for a GTRS kit if i was you, my mate Joey has a highflow from GCG, but it died on him last week, which only last him about a year and a bit, the turbo gets abused a fair abit, because he runs it on track n stuff all the time, depend what you wanna do with the car, and suit the best setup that you need.
Dan hows your cams going? all sorted?
i saw your died hi-flow last week
it looks dead set.. DIED lol...
Hopefully you get it back soon.