4Pieces Fuel Injector Assembly Compatible 4JB1 Engine Fuel Injector +Nozzle KBAL-P001A. The injector's precise design ensures accurate fuel delivery, enhancing engine efficiency. Designed for straightforward installation, these injectors can be seamlessly integrated into your engine system. Fuel injectors directly affect the air/fuel ratio for the engine and new fuel injectors do require a new or updated tune. We also suggest that you check the other component of the engine before installation., Manufacturer: Nwirmtm