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

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SKU IAG-ENG-1202

The IAG Stage 2 Short Block is designed for modified EJ25 Subaru's that need a stronger short block to support increased cylinder pressures created by additional boost pressure. The IAG Stage 2 short block builds off the Stage 1 block's strengths by adding IAG Spec H-Beam forged connecting rods. The upgraded connecting rods and race bearings are able to support additional engine load produced by larger turbochargers or increased boost which the OEM STI rods found in the Stock and Stage 1 short blocks cannot support reliably.

Each IAG Stage 2 Short Block starts with brand new EJ25 Subaru 2.5L, 99.5mm stock bore engine case halves as standard. The case haves are carefully measured and assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft, which is matched to ACL or King race main bearings. The Stage 2 Short Block features IAG Spec H-Beam Connecting Rods with ARP2000 rod bolts, 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 FSR 99.5mm Forged Pistons are carefully selected, measured, and installed to finish off the short block.

Each Stage 2 Short Block features IAG Spec JE FSR 99.5mm Forged Pistons. These 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. FSR forgings reduce mass and wear caused by friction without sacrificing strength. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, also this reduces weight significantly. Featuring smooth flowing radii on the domes and dishes, the design promotes excellent flame travel. The pistons are secured to the rods with .905 x 2.250" x .180" wall carbon steel wrist pins with Tru Arc locks.

Stage 2 Short Block Includes:


  • Case Halves -Brand new Subaru OEM case halves 99.5mm stock bore
  • Pistons -IAG-Spec JE FSR 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 bolt
  • Compression Ratio:8.5:1 on D Cylinder Heads (EJ255), 8.2:1 on B, V, and W EJ257 Heads with standard thickness gasket.


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

Additional Options Available:

  • Oil Pickup, Baffle and/or Windage Tray - Upgraded oil pickup, oil control baffle, and windage tray
  • Oil Pump - Most popular off the shelf pumps to use on EJ25 engines
  • Hardware / Seals - OEM cover and seal kit

    Please review the PDF document below regarding installation, break-in procedures and warranty information.

    PDF After Sale Document - Contains Shipping, Engine Care and Warranty Information

    The IAG Stage 2 Short Block is designed for modified EJ25 Subaru's that need a stronger short block to support increased cylinder pressures created by additional boost pressure. The IAG Stage 2 short block builds off the Stage 1 block's strengths by adding IAG Spec H-Beam forged connecting rods. The upgraded connecting rods and race bearings are able to support additional engine load produced by larger turbochargers or increased boost which the OEM STI rods found in the Stock and Stage 1 short blocks cannot support reliably.

    Each IAG Stage 2 Short Block starts with brand new EJ25 Subaru 2.5L, 99.5mm stock bore engine case halves as standard. The case haves are carefully measured and assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft, which is matched to ACL or King race main bearings. The Stage 2 Short Block features IAG Spec H-Beam Connecting Rods with ARP2000 rod bolts, 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 FSR 99.5mm Forged Pistons are carefully selected, measured, and installed to finish off the short block.

    Each Stage 2 Short Block features IAG Spec JE FSR 99.5mm Forged Pistons. These 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. FSR forgings reduce mass and wear caused by friction without sacrificing strength. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, also this reduces weight significantly. Featuring smooth flowing radii on the domes and dishes, the design promotes excellent flame travel. The pistons are secured to the rods with .905 x 2.250" x .180" wall carbon steel wrist pins with Tru Arc locks.

    Stage 2 Short Block Includes:


    • Case Halves -Brand new Subaru OEM case halves 99.5mm stock bore
    • Pistons -IAG-Spec JE FSR 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 bolt
    • Compression Ratio:8.5:1 on D Cylinder Heads (EJ255), 8.2:1 on B, V, and W EJ257 Heads with standard thickness gasket.


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

    Additional Options Available:

    • Oil Pickup, Baffle and/or Windage Tray - Upgraded oil pickup, oil control baffle, and windage tray
    • Oil Pump - Most popular off the shelf pumps to use on EJ25 engines
    • Hardware / Seals - OEM cover and seal kit

      Please review the PDF document below regarding installation, break-in procedures and warranty information.

      PDF After Sale Document - Contains Shipping, Engine Care and Warranty Information


      This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov