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IAG Stage 2 Tuff EJ25 Subaru Short Block - Subaru Models (inc. 2006-2014 WRX / 2004+ STI)
IAG Stage 2 Tuff EJ25 Subaru Short Block - Subaru Models (inc. 2006-2014 WRX / 2004+ STI)
IAG Stage 2 Tuff EJ25 Subaru Short Block - Subaru Models (inc. 2006-2014 WRX / 2004+ STI)
IAG Stage 2 Tuff EJ25 Subaru Short Block - Subaru Models (inc. 2006-2014 WRX / 2004+ STI)
IAG Stage 2 Tuff EJ25 Subaru Short Block - Subaru Models (inc. 2006-2014 WRX / 2004+ STI)
IAG Stage 2 Tuff EJ25 Subaru Short Block - Subaru Models (inc. 2006-2014 WRX / 2004+ STI)
IAG Stage 2 Tuff EJ25 Subaru Short Block - Subaru Models (inc. 2006-2014 WRX / 2004+ STI)
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User Media for: IAG Stage 2 Tuff EJ25 Subaru Short Block - Subaru Models (inc. 2006-2014 WRX / 2004+ STI)

IAG Stage 2 Tuff EJ25 Subaru Short Block

Subaru Models (inc. 2006-2014 WRX / 2004+ STI)

Write a Review | 9 Q&As
Part # IAG-ENG-1213
$3,799.99

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Features & Product Details

RallySport Direct carries the highly sought-after high-performance upgrades and accessories brought to you by IAG Performance. This short block is a no-nonsense choice for your Racecar, Rally Car, Overlander or even a strong option for your Daily Driver!

On this page, you are looking at the IAG Performance Stage 2 TUFF Short Block. This short block has been bored and honed to 99.75mm using IAG's in-house Sunnen SV-10. The result is tighter wall clearances on the pistons to help produce a quieter running engine. It is carefully measured and assembled using forged pistons and a new 2017+ STI Nitride Treated crankshaft.

Here are the details:

  • Brand new Subaru OEM Subaru case halves bored and honed to 99.75mm
  • IAG-Spec JE 99.75mm Forged Pistons with perfect skirt coating
  • .180" chromoly steel pins, clips
  • IAG Spec Tuff H-Beam connecting rods
  • ARP2000 Rod bolts
  • ACL rod and main bearings 
  • New Subaru Nitride Treated 2017+ STI crankshaft
  • Standard FHI Subaru case bolts
  • Note: Compression ratio is subject to change based on cylinder heads and head gaskets used. 

  • 8.2:1 on B, V, and W cylinder heads (EJ257)
  • 8.5:1 on D cylinder heads (EJ255)
  • Specifications

    Brand: IAG Performance
    Assembly: Assembled
    Bore Size (mm): 99.75
    Compression Ratio: 8.2:1
    Crank: OEM Forged
    Crank Size: OEM
    Displacement: 2.5L
    Piston Material: Forged Aluminum
    Power Output Rating (BHP): 625
    Rods: OEM Forged
    Mfgr. Warranty: 12mo / 12k Miles
    Condition: New Product
    Return Policy:
    Standard

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    QUESTIONS & ANSWERS

    • Q: engine  Subaru6663 months ago

      what is the best head gasket to use with this block, using an up graded heads and cams looking for about 550 hp
      • 0 of 0 people found the following answer helpful

        A:  Rick will advocate for the GrimmSpeed head gaskets, but as for thickness, we would recommend talking to your tuner or builder for their recommendation.

        Lane H. @ RallySport Direct 2 months ago  
          
        Was this answer helpful?
    • Q: engine  Subaru6664 months ago

      whats the best headgasket to use with stock heads ???
      • 0 of 0 people found the following answer helpful

        A:  Rick will advocate for the GrimmSpeed head gaskets, but as for thickness, we would recommend talking to your tuner or builder for their recommendation.

        Lane H. @ RallySport Direct 2 months ago  
          
        Was this answer helpful?
    • Q: compatability  SlightlyModdedMedia4 months ago

      Would this block work with the heads off a 2002 WRX with the 2.0L? Or do you have a block that would?
      • 0 of 0 people found the following answer helpful

        A:  You will need some machining on your heads to fit, but you can bolt the EJ20 heads to an EJ25.

        Lane H. @ RallySport Direct 4 months ago  
          
        Was this answer helpful?
    • Q: What oil pump to go with  2013stiisback12 months ago

      Planning on getting stage 2 tuff short block. Trying to put together the part list I need to build the rest of the motor. First motor had rod bearing failure and they wouldn’t cover under warranty due to Cobb tuner. Wanted to know what oil pump to go with that is the best for this build. Also what gasket set to go with. List: Killer B pick up & Baffle, turbo oem Banjo bolt w/ filter, turbo oil feed lines. Have a oem oil cooler, Gates Timing belt kit w/water pump. Please add anything else I might need. Thank you
      • 0 of 0 people found the following answer helpful

        A:  Hey, great questions. For the oil pump I would recommenced the OEM 12mm pump, as that will give you the proper oil volume while still keeping the pressures in check. Now with that I would also recommend the OEM gasket kit along with the ARP 11mm head studs and a good set of headgaskets like the Grimmspeed or Tomei. Also in regards to the oil filter in the banjo bolts, I would just remove the filters and run the JDM black Tokyo Roki oil filters(we don't get them unfortunately) and just do normal oil change/filter change intervals. Other than that it seems like you have everything covered but if you do have any questions please feel free to call in or hit us up on chat. Thanks!

        Rick C. @ RallySport Direct 12 months ago  
          
        Was this answer helpful?

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