IAG-Modified Subaru EJ25 Engine
Subaru’s EJ series of engines was introduced in 1989 with all examples sharing a 16-valve horizontal “boxer” flat-four architecture. This 2.5-liter flat-four was initially modified and assembled in 2021 by IAG Performance in Westminster, Maryland with the following components:
- IAG Stage 2 Tuff short block
- STi crankshaft
- IAG-spec H-beam connecting rods
- JE 99.75mm pistons
- IAG Stage 1 2.0L cylinder heads
- GSC Stage 1 billet camshafts
- ARP head studs
- JE Pro Seal head gaskets
- IAG billet half-moon valve cover cam seals
- IAG Competition Series oil pan, pickup, and windage tray baffle
- IAG timing kit
- Replacement factory water pump, valve lifters, gaskets, and seals
The engine was installed in 2021 in a track-only 2005 WRX and was used for two track seasons. This EJ25 engine is offered at no reserve by the seller in Pennsylvania with build invoices.
A red anodized aluminum plaque denotes the IAG engine number as #07746.
The engine was pulled in 2023, and a subsequent rebuild was carried out by Andrewtech, now known as Bespoke Performance and Fabrication, in Gaithersburg, Maryland. The IAG Stage 2 Tuff block, STi crankshaft, IAG-spec H-beam connecting rods, IAG Stage 1 2.0L cylinder heads, GSC camshafts, and IAG Competition Series oil pan, pickup, and windage tray baffle were reused. The cylinder heads were decked, a three-angle valve job was performed, the camshaft bearing caps were polished, and the following parts were installed:
- JE 99.85mm FSR pistons
- GSC chrome polished intake and exhaust valves
- Valve seals
- GSC valve springs and titanium retainers
- ARP head studs
- IAG billet half-moon valve cover cam seals
- RCM alloy cam gears
- IAG timing belt kit
- IAG Stage 2 oil pump
- Replacement factory water pump, gaskets, and seals
- IAG engine mounts
The Competition Series pickup and windage tray baffle are depicted above.
In-process photos of the 2023 rebuild are presented in the gallery.
Video Gallery
Photo Gallery
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Friday, December 20 at 10:23am PT
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BaT Essentials
- Chassis: N/A
- IAG-Modified Subaru EJ25 Engine
- IAG 2.5L Stage 2 Tuff Block
- STi Crankshaft
- IAG-Spec H-Beam Connecting Rods
- JE FSR 99.85mm Pistons
- IAG Stage 1 2.0L Cylinder Heads
- GSC Stage 1 Camshafts
- GSC Valves, Valve Springs, & Retainers
- ARP Head Studs
- IAG Stage 2 Oil Pump
- IAG Competition Series Oil Pan Kit
- RCM Alloy Timing Gears
- IAG Timing Belt Kit
- Factory Replacement Water Pump
- Rebuild Completed in 2023
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