Subaru owners listen up! If you're dealing with drivetrain issues on your manual transmission vehicle, this center differential assembly might be exactly what you need. It fits a ton of Subaru models including Baja (2003-2006), Crosstrek (2016-2017), Forester (1999-2013), Impreza (1999-2021), WRX/STI (2002-2014), Legacy (1999-2009), Outback (1999-2009), and XV Crosstrek (2013-2015). IMPORTANT: This only works with 5-speed manual transmissions, not automatics! The part numbers it replaces include 38913AA100, 38913AA101, and of course 38913AA102. The shell is made from tough 45 steel while the gears are 20CrMnTi material - translation: this thing is built to handle serious power and wear. We've got a team of 38 differential engineers backing this product with professional support, plus a lifetime warranty against defects. Double-check your model and transmission type before ordering, but once installed, this differential should restore that smooth Subaru driving experience you love.