Hi guys,
Just to update, yes it turns out that the injector was the culprit... one of them wasn't flowing properly.... so Justin ended up using the STI ones, they are a yellow top though so not sure if it's 440 or 565.
It's now been retuned to 278hp atw and running 20 psi boost at a safe tune... Justin said the Turbo is maxed out and injector is running at 97%... not sure whether or not a bigger injector is needed or not but I presume Justin would advise that if needed.
I'm due to pick up the car tomorrow... so excited and can't wait
@nick73 I actually wouldn't mind buying the STI injectors from you for that price, I'll just keep them in case I need them or if I ever get a slightly bigger Turbo, but would it fit a 99 model?
Thanks again guys for the inputs