When to upgrade from 24lb injectors?

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It is not a boost issue, it is a hp one. With an FMU you could make 400rwhp on the 24s. If your engine is basically stock you could run a blower with under 14psi along with an FMU and still be safe. I am making 415rwhp with a 4:1 FMU and 30# injectors. I have enough fuel to totally drown the engine if I want.