3696 is sold individually, Short Body Siemens High Impedance (12.5 ohms) Fuel Injector with a flow rate of 60 lb/hr (630cc) @43.5psi. These injectors measure 37.25mm O-ring to O-ring centerline, feature Bosch style connectors with a Yellow Band around them for identification and are capable of up to 950HP @ 58psi when run as a set of 8 with ProFlo4. These injectors are offered as a replacement or upgrade for the ProFlo EFI Systems and are compatible with many OEM and aftermarket EFI systems.