I'm fairly new to the forced induction game, but with that much boost, the fact you don't have forged pistons, I wouldn't run anything less than 30 lb injectors. You would rather be a little rich running more injector, than leaning out and melting a piston because you have to small an injector. 30's are the same price as 24's anyway.
I'm only running 6 lbs of boost right now, no FMU, 30 lb injectors and my car runs fine. I haven't had it on an wide band O2 to tell me exactly how it's running, but when I pulled the plugs they were golden brown in color, which I think is exactly what you want to see.
Like I said, I'm no expert yet, but I'm trying to learn.
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91 single turbo vert
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