The Edelbrock #15901 injectors are Bosch style, standard long length (60mm O-ring to O-ring dimension), and are high impedance 50 lb/hr at 43.5 psi (300 Kpa). ?They have a dual spray pattern and use USCAR style connectors. ?These injectors can handle 100 psi without shutting off. These are included in our #1584, #1588, and #15986 E-Force supercharger systems.