THIS IS A 4 NOZZLE TBI INJECTOR PLATE SYSTEM. IT IS A SIMPLE INSTALL. MOST USE THIS SIMPLE SYSTEM TO REPLACE CARBURETED ENGINES. THIS HARDWARE CAN BE FIRED BY ANY EFI CONTROOLER BOX OR ECU! IT IS DESIGNED FOR BATCH FIRE CONFIGURATIONS UP TO 400HP. TBI FLOWS 1200CFM. *AVAILABLE IN OTHER CONFIGURATIONS.