IAG - Stage 2 CNC Ported EJ25 11mm Oil Pump for 04-21 STI, 02-14 WRX, 05-09 LGT, 04-13 FXT - Subaru EJ25T

2026-04-20T11:53:55+08:00

Vendor: IAG
Type: Build Your Block
Price: 819.70

Specifications:
Manufacturer: IAG
Reference Number: IAG-ENG-2240

The 11mm Subaru Oil pump is one of the most popular off the shelf pumps to use on EJ25 engines. Originally equipped on the 2008-21 STI Dual AVCS engines, it provides an adequate amount of pressure and flow that fits the needs of many OE and built engines. But, as with almost anything, there is room for improvement. The IAG Stage 2 CNC Ported EJ25 11mm Oil Pump design allows for increased flow volume and pressure, ensuring that the bearings have a sufficient oil film under all power levels and driving conditions. The additional oil flow to the engine provides a greater oil reserve to operate the AVCS solenoids and cam gears - giving you more consistent performance results.
Each IAG Stage 2 oil pump starts as an OEM Subaru pump with 11mm rotors. IAG completely disassembles the new oil pump including pulling the rotors, backing plate & pressure relief valve. Next, the main body is fixtured in our in-house 5-Axis Centroid CNC machine where the inlet and outlet passageways are CNC ported. This allows for a larger, more consistent pathway for the oil into and out of the gerotor internals and helps to prevent cavitation. The Oil Pump Outlet where it meets the engine block is also CNC “Port Matched”, for a precise transition into the engine block. The Inlet and Outlet sides of the gerotor are also opened up on the CNC mill to reduce inlet side cavitation, and to reduce outlet side pressure drops.
The pressure relief valve piston is REM Polished, which provides a non-directional, low Ra, polished finish. This reduces friction, heat and possibility of the relief valve piston galling and sticking, a common failure point on the OEM pumps. 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. The pump ships ready to install, with all hardware and seals required for installation.
Package Includes: (x1) IAG 11mm Blueprinted Oil Pump, (x1) Front Crank Shaft Seal, (x1) Oil Pump O-ring, (x7) Oil Pump Zinc Plated Bolts
Fitment: 04-21 STI, 02-14 WRX, 05-09 LGT, 04-13 FXT

Taxes:

Singapore and Malaysia: All import taxes are included in our pricing.

European Tva, Iva: Taxes will be calculated during checkout at our company import rate. No additional charges will be added by your local authority.

USA: If this product is shipped from our US warehouse then taxes are included. Otherwise, please refer to the rest of the world paragragh.

Rest of the World: Other countries may have to pay their local import tax depending on your country's regulations.
Shipping:

This product will be shipped from our US Warehouse to any global location. Shipping via DHL within 3 to 7 days depending on location and local custom check. Allow two additional days for order processing.
Every Monday our team keeps you in the loop by sending out an "estimated time of arrival" email.This part fits:

EJ25T | 2500cc | DOHC | 16v | TC | H4