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IAG Stage 2 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT

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IAG-ENG-1202
$3,799.99 $3,419.99

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IAG Stage 2 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT

IAG Stage 2 Short Block

The IAG Stage 2 Short Block is designed for modified EJ25 Subaru's that need a beefed-up performance short block. The IAG Stage 2 short block builds off the Stage 1's strengths by adding IAG Spec H-Beam forged connecting rods. The upgraded rods and bearings are able to support additional engine load produced by larger turbochargers that the OEM STI rods cannot support reliably. Each IAG Stage 2 Short Block starts with new Subaru 2.5L 99.5mm stock bore EJ25 engine case halves as standard. The short block is measured and assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft that is matched to ACL or King race main bearings. IAG-Spec H-Beam rods and ARP2000 rod bolts are utilized along with ACL or King race rod bearings. The case halves are sealed with new OEM main case bolts and sealant. Finally, IAG-Spec JE 99.5mm Forged Pistons are spec'd and installed finishing off the short block. 

Stage 2 Short Block Includes:
  • Case Halves - Brand new Subaru OEM case halves 99.5mm stock bore
  • Pistons - IAG-Spec JE 99.5mm Forged Pistons, Ring Set, .180" Chromoly Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
  • Connecting Rods - IAG-Spec H-Beam Rods with ARP2000 rod bolts
  • Rod / Main Bearings - ACL or King Race Bearings
  • Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft
  • Case / Main Bolts - Standard FHI Subaru case bolts

Additional Options Available: 
  • Hardware / Seals - OEM cover and seal kit - Part # IAG-ENG-1720 [Add $105.99]

Power: The IAG Stage 2 Short Block has a power output rating of 575BHP.

*All IAG Short Blocks are balanced and blueprinted. 

Compression Ratio: 8.5:1 on D Cylinder Heads (EJ255) 
Compression Ratio: 8.2:1 on B, V and W EJ257 Heads with standard thickness gasket.


Hardware / Seal Option:


Not planning on reusing your original short block service plugs and covers? IAG offers a simple comprehensive cover and seal kit that includes (1) Rear main seal, (3) OEM wrist pin plugs, (3) OEM wrist pin plug washers, (1) OEM separator cover, (6) OEM separator cover bolts, (1) OEM wrist pin service cover, (1) OEM wrist pin service cover O-ring and (2) OEM wrist pin service cover screws. *If you are reusing your original wrist pin service plugs and covers always replace the (3) OEM wrist pin plug washers and (1) wrist pin service cover O-ring before installing a short block to avoid potential leaks. *Never reuse a rear main seal on a new short block. 


Vehicle Compatibility-
2002-05 Subaru WRX (Requires Mods)
2006-14 Subaru WRX
2004+ Subaru STI
2005-09 Subaru Legacy GT
2004-13 Subaru Forester XT


*Pictures used for marketing purposes only, actual products may vary

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Returns Policy

Returns may be accepted within 14 days of purchase pending Return Merchandise Authorization (RMA). No returns or cancellations on special order items. All returns will be charged a 20% restocking fee, no exceptions.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. Item must be able to be resold as new. Several types of goods are exempt from being returned. Hazardous materials, fluids, greases, chemicals, and clothing are not able to return.

Free shipping is available within the lower 48 states for most orders totaling $199 or more. A free shipping option will be available during checkout. This offer is for delivery address in the continental United States and excludes shipments going to Alaska, Hawaii, Military Boxes, and items that require freight shipping.

Processing Time
Patterson Performance stocks a large quantity of items at any given time. Some items may require drop shipping from one of our various distributors. In stock items will ship within 1-2 business days. If you're needing your product quickly, please contact us to verify product availability before placing your order. Orders requiring additional verification (security concerns, incorrect information, etc.) may need additional processing time. Estimated shipping dates are not guaranteed and are subject to change based on inventory levels and manufacturer lead times. Backordered items are shipped immediately once available.

Items ship daily, If the item you ordered is not in stock, a member of our team will contact you via email / phone.

Patterson Performance will only ship to an address that varies from your billing address if payment is made via Paypal or a financing partner.

Patterson Performance ships from multiple warehouses throughout the United States, and sometimes from manufacturers overseas.

You can simply contact us via email / telephone for a live inventory check

P65 WARNING: Cancer and Reproductive Harm

Find more information at www.P65Warnings.ca.gov.

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