This is that same pump that come stock on the 08 STi. It will fit all WRX and STi 2.0L/2.5L - EJ20 / EJ25 Motors.
This is a 11mm pump that flows more volume then the standard pumps prior to 2008, perfect upgrade for when you are building the motor or changing the timing belt.
11mm Subaru OEM Oil Pump found standard on the 2008+ STI
1 x Subaru 2.5L OEM 11mm Oil Pump
2001-14 Subaru WRX/STI