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This is Subaru's factory alternator for turbocharged EJ-series models: 2006–2010 WRX, 2007–2010 STI, 2005 Legacy GT and Outback XT, and 2006–2011 Forester XT, plus several naturally aspirated Impreza and Forester trims. It is a direct-fit unit built to the same specification as the alternator that came on the car, so the mounting, pulley and connector match without adapters. The main draw over a rebuilt or aftermarket alternator is that it is the exact factory part, which matters on these cars because the charging system feeds the ECU, sensors and accessories. The trade-off is that a remanufactured unit or a higher-output aftermarket alternator can offer more amperage for big audio or accessory loads, while this one stays at stock output.
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Owners of these turbo Subaru models generally treat the factory alternator as the safe replacement: it bolts up, plugs in and charges correctly. Complaints center on cost compared with rebuilt units and on the stock output being modest for cars with added electrical load.
This is a genuine Subaru OEM alternator, part number 23700AA8608A. It is the factory charging system component that keeps the battery charged and powers the vehicle's electrical systems. It is built to the same specifications as the original unit.
It uses OEM-grade internals: rotor, stator, rectifier and voltage regulator. The connector and mounting points match the original harness and engine bay brackets.
It is a direct bolt-on replacement for the factory unit and needs no adapter brackets. No special programming or calibration is required after installation.
