IAG has just dropped their Stage 1 and Stage 2 oil pumps for all EJ engines. We will be using their Stage 2 pump on our own Project GD STI. The IAG Stage 2 pump has been blueprinted and modified to improve both pressure and flow volume over even the JDM 12mm pump that a lot of people install on their modded engines.
IAG starts with a brand new OEM Subaru 11mm pump. IAG uses an 11mm pump as the basis of their pump because in their testing their Stage 2 pump outflows a similarly modded 12mm pump! The other reason is that the 12mm pump is not readily available in the USA and must be imported from Japan at a substantially higher price. IAG is currently working on developing mods for the 12mm pump and if they can get it to give a significant advantage over the 11mm, it will be available for sale as well.
You can see all of the torque verification marks all over every fastener of the IAG pump. This is part of their extensive quality control process. You can read about IAG’s advanced manufacturing technology and quality here.
Here you can see the CNC porting of the pump’s outlet port. The porting is done to reduce pressure drop, increase flow, and reduce the risk of cavitation.
Here is the CNC porting of the pump’s inlet port. CNC porting reduces any variables associated with hand porting the passages.