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2015 WRX
2,575 Posts
Discussion Starter · #1 ·
I have a V1 STi RA with Apexi RHF5 VF22 turbo. I need to pick up larger injectors for a tune and I'm trying to determine what an appropriate size would be. I will be running a Walbro 255lph fuel pump and hp goal is 275-300 whp. I'm currently debating between 550s or 650s. I would like to run a safe IDC but if I can achieve that with 550s that is fine.

Any suggestions? I think I've seen people run STi side feeds with a VF39 and do 300whp without any issues.
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