Subaru 16611AA521 Fuel Injector Assembly

The Subaru 16611AA521 is a genuine OEM fuel injector manufactured by Denso (part number 195500-3920) for the 2.0L turbocharged DOHC EJ205 engine. It features an EV6 body style with top-feed inlet and a 4-hole nozzle spray pattern. The injector operates at high impedance and uses a Sumitomo electrical connector. Flow rate is rated at 425 cc/min (305.6 g/min) at 3 bar (43.5 psi) test pressure using n-heptane. This injector is calibrated for the specific flow and spray requirements of the 2002-2005 Subaru Impreza WRX models. The component consists of a composite plastic and metal body with a stainless steel nozzle tip. It is designed as a direct replacement for the factory-installed unit, requiring no modifications for installation. The part is sold individually or in matched sets of four for balanced cylinder fueling. Cross-reference part numbers include 16611-AA521, 1955003920, and various aftermarket designations such as FJ857 and M952.