The 2006-2020 Subaru WRX STI Fuel Injector Top Feed Set includes 4 topfeed injectors specifically designed for the XT WRX and STI models. Made by Subaru, these direct replacement injectors are in black color and were manufactured in the United States with a production date of 10-Sep. With the manufacturer part number 16611AA720, these fuel injectors are a great choice for improving the performance and fuel efficiency of your Subaru vehicle.