Ok I am looking at upgrading my fuel system. I am gonna be running about 15 psi of boost. I was thinking on upgrading injectors and fuel pump. So would 720cc injectors be enough? Do I need 4 of them or just 2 for secondary? Or 2 for primary or what? I am new to all this turbo stuff so any help is apprecated.
Thank You

 

2 of them should be sufficient for 15 PSI of boost