IAG Stage 1 Short Block

2004-2021 Subaru STI / 2006-2014 WRX

Ships for free in the 48 states

SKU: IAG-ENG-1002We price match!

Out of Stock

The Stage 1 Short Block features forged pistons to handle up to 500 BHP in the Subaru STI. 


IAG Stage 1 EJ25 Subaru Short Block


  • Brand new Subaru OEM case halves at 99.5mm stock bore
  • IAG-Spec JE 99.5mm Forged Pistons and Ring set
  • .180" Chromoly steel pins, clips along with coated skirts and offset wrist pins
  • Early OEM STI connecting rods
  • ACL rod and main bearings 
  • New Subaru Nitride Treated 2017+ STI crankshaft
  • Standard FHI Subaru case bolts
  • Power output rating of 500 BHP



The IAG Performance Stage 1 EJ25 Short Block is perfect for those of you with light modifications, and who want a reliable short block built with stronger internals. The EJ25 is known for ring land failures, and if unchecked it could lead to engine failure due to oil starvation, and blow-by. The Stage 1 Short Block will have upgraded forged JE pistons that have been paired with new OEM STI connecting rods that are connected to a brand new nitrided 2017+ 2.5L STI crankshaft. The motor will come assembled on performance main and rod bearings that have been properly clearanced, all with new OEM case halves that are held together with new case bolts and sealant. 

This is a great rebuild option for those of you who want an assembled short block built by one of the best industry-leading performance shops available. 



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