This is the OEM 11mm STI oil pump for Subaru 2.5L engines; it is well made and priced right too. We strongly suggest replacing your oil pump when ever you need to replace the timing belt or if you are having any sort of engine internal work done to WRX or STi. This is a must when converting a 2.0L car to an STi shortblock, as it is not included and the 2.0L pump will not fit the 2.5L.
