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STi phase 1 injectors are 380's mate, better off getting some cheaper Ph2 440's with superior spray pattern. These can be modified to flow greater and are easy to fit with adaptors. I have Ph2's on my V2 STi with Zen adaptors.
I have some denso 550's phase 2 but have phase 1-1.5 adapters fitted. Were fitted to my95 wrx running 370 bhp but now breaking. Perfect working order. £350.