The Edelbrock #15903 is a 60 pound-per-hour Fuel Injector for the E-Street TBI, ProFlo EFI, and Edelbrock supercharger?Systems. It is a ?compact body, Siemens injectors. They feature Bosch style connectors and are capable of up to 800 horsepower. The injectors are offered as a replacement for the E-Street TBI, #1572 supercharger, as an upgrade to our other supercharger kits, or as a supplemental part for our competition supercharger kits. It is a Black compact injector with a Blue colored band. Set of 8 Injector.