Fuel Injector Clinic performance fuel injector set.Manufacturer Part Number: ISRD3-0540H-4 & PGTUSC4VEHICLE / ENGINE COMPATIBILITY: Custom / universal eight-cylinder injector setINJECTOR APPLICATION VERIFIED:FIC 540cc injector set for Custom / universal eight-cylinder injector set Brand: Fuel Injector Clinic / FIC Flow Rate: 540cc where specified in the part number Impedance: High-Z / High Impedance where indicated by the H suffix Fuel Injector Clinic injector sets are flow matched and include application-specific fitment components where applicable. Designed for gasoline and E85 performance applications. Please confirm injector size, connector type, fuel rail setup, and fitment before installation or tuning.