The Edelbrock 15901 injectors are Bosch style, standard long length (60mm O - ring to O - ring dimension), and are high impedance 50 lbhr 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.