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  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)
  • IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments (IAG-ENG-1002)

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    IAG Stage 1 2.5L Subaru Short Block | Subaru Multiple Fitments

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    IAG Stage 1 Subaru Short Block - 2.5L

    The IAG Stage 1 Short Block is perfect for lightly modified EJ25 Subaru's that need a basic and reliable performance short block. Subaru turbo engines are commonly known for piston ring land failures and if gone unchecked lead to rod knock and total engine failure due to oil starvation from blow by. IAG's Stage 1 Short Block includes upgraded forged pistons along with performance main and rod bearings that replace the OEM components that are prone to common failure on Stage 2 and up vehicles. Each IAG Stage 1 Short Block starts with a new Subaru 2.5L 99.5mm bore EJ25 engine case halves as standard. The short block is measured and assembled using a new 2017+ Nitride Treated Subaru 2.5L STI crankshaft that is matched to ACL or King main bearings. Early style OEM STI rods are utilized along with ACL or King rod bearings. The case halves are sealed with new OEM case bolts and sealant. Finally, 99.5mm IAG-Spec JE Forged Pistons are spec'd and installed finishing off the short block. 

    Features

    • The IAG Stage 1 Short Block has a power output rating of 475BHP
    • 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

    Applications

    • 2002 - 2005 Subaru WRX (w/ mods)
    • 2006 - 2014 Subaru WRX
    • 2004 - 2020 Subaru WRX STI
    • 2005 - 2009 Subaru Legacy GT
    • 2004 - 2013 Subaru Forester XT

      DOES NOT FIT THE 2010-2012 Legacy

    What's In The Box?

    • Case Halves - Brand new Subaru OEM case halves 99.5mm Stock Bore
    • Pistons - IAG-Spec JE 99.5mm Forged Pistons, Ring Set, .180" Chromoly Steel Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
    • Connecting Rods - Early OEM (Stronger Style) STI rods
    • Rod / Main Bearings - ACL or King Bearings
    • Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft
    • Case / Main Bolts - Standard FHI Subaru case bolts

    Notes

    •  The original part number was IAG-ENG-1000, which has been superseded to IAG-ENG-1002

    IAG Stage 1 Subaru Short Block - 2.5L

    The IAG Stage 1 Short Block is perfect for lightly modified EJ25 Subaru's that need a basic and reliable performance short block. Subaru turbo engines are commonly known for piston ring land failures and if gone unchecked lead to rod knock and total engine failure due to oil starvation from blow by. IAG's Stage 1 Short Block includes upgraded forged pistons along with performance main and rod bearings that replace the OEM components that are prone to common failure on Stage 2 and up vehicles. Each IAG Stage 1 Short Block starts with a new Subaru 2.5L 99.5mm bore EJ25 engine case halves as standard. The short block is measured and assembled using a new 2017+ Nitride Treated Subaru 2.5L STI crankshaft that is matched to ACL or King main bearings. Early style OEM STI rods are utilized along with ACL or King rod bearings. The case halves are sealed with new OEM case bolts and sealant. Finally, 99.5mm IAG-Spec JE Forged Pistons are spec'd and installed finishing off the short block. 

    Features

    • The IAG Stage 1 Short Block has a power output rating of 475BHP
    • 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

    Applications

    • 2002 - 2005 Subaru WRX (w/ mods)
    • 2006 - 2014 Subaru WRX
    • 2004 - 2020 Subaru WRX STI
    • 2005 - 2009 Subaru Legacy GT
    • 2004 - 2013 Subaru Forester XT

      DOES NOT FIT THE 2010-2012 Legacy

    What's In The Box?

    • Case Halves - Brand new Subaru OEM case halves 99.5mm Stock Bore
    • Pistons - IAG-Spec JE 99.5mm Forged Pistons, Ring Set, .180" Chromoly Steel Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
    • Connecting Rods - Early OEM (Stronger Style) STI rods
    • Rod / Main Bearings - ACL or King Bearings
    • Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft
    • Case / Main Bolts - Standard FHI Subaru case bolts

    Notes

    •  The original part number was IAG-ENG-1000, which has been superseded to IAG-ENG-1002

    Customer Reviews

    Based on 1 review
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    J
    J.R.
    Professionally built

    I did my research before buying this. Nothing but great reviews. When it arrived it was clean, oiled and looked professionally built. Ive had no issues with it. I can't wait to pro tune it.

    MAP Limited Lifetime Warranty

    1.) All MAPerformance in-house fabricated parts include a Limited Lifetime Warranty for the Original Purchaser. This warranty only applies to the original purchaser and is non-transferrable. If the product fails it would need to be determined by MAPerformance that it is due to manufacturing defects in materials or workmanship.

    2.) This does not cover normal wear and tear. Improper use, modification, or abuse voids this warranty. MAPerformance will not be held responsible for additional costs due to the failure of a product (cost of sale, towing, labor, etc.). Warranty claims must be submitted to MAPerformance for review.

    3.) You must create a support ticket to acquire your return authorization number prior to returning the product.

    4.) Warranty claims will not be honored if the product was not purchased through an approved dealer.

    For warranty evaluation please create a support ticket via this form here.

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