Injector rating is approximately 65lb on a 58 psi fuel system. This injector comes from MOPAR, and is the Stage 2 SRT-4 injector. This injector is plug and play on the HEMI as a 65lb fuel injector. Use of this injector will require custom Diablosport CMR tuning in order to adjust idle and partial throttle fuel trim. Contact HHP for all your tuning needs. Quantity: 8 Injectors Use of an aftermarket boost-a-pump or upgraded fuel system may be required and is recommended to keep fuel system pressure steady on higher horsepower applications making 550 or more NA horsepower or 500 Forced Induction RWHP.