The IHI VF52 Turbo is factory-issue on the mighty 265-hp 2009-2014 WRX. It's a direct bolt-on for the 2008 WRX and the 2005+ Legacy GT. (Note that those cars would require custom ECU tuning to account for the larger turbo).
This OEM Subaru WRX turbo will NOT bolt to pre-2008 WRX cars, nor will it fit the 2015+ WRX.
No core required.
Fits all 2008-2014 Subaru WRX, and 2005-2009 Legacy GT/Outback XT.