IAG Stage 1 Blueprinted 11mm Oil Pump 2002-2014 WRX / 2004-2021 STI / 2005-2012 Legacy GT / 2005-2009 Outback XT / 2004-2013 Forester XT

The oil pump is quite literally the heart of any engine. Responsible for pumping the oil through the entire engine, it is one of the most critical parts, but often one of the most overlooked.

The IAG Stage 1 Oil Pumps start as a new OEM Subaru pump with 11mm rotors. The pump is completely disassembled and checked for contaminants or debris from the manufacturer. The pump and all its components are then ultrasonically cleaned. Once the pump is free from impurities, it undergoes a modification process where the OEM Pressure Relief Valve Piston is REM polished, providing a low Ra surface, which reduces the friction of the component, and greatly reduces the chance of the piston galling or sticking in the bore - a problem that is frequently seen even on brand new oil pumps. Each pump is also modified to increase oil pressure which aids in ensuring proper oil delivery.

The piston is reinstalled and confirmed to operate correctly. The rotors are measured and checked to be within the manufacturer's specification - aka Blueprinted, and then installed. The pump is then put together with a light coating of assembly lube to reduce friction and scuffing and aid in priming on first start up. Finally, the backing plate is installed. Loctite is added to the hardware, and each piece receives a painted mark after it is correctly torqued.