IAG Stage 2 Tuff Short Block

2004-2021 Subaru STI / 2006-2014 WRX

Ships for free in the 48 states

SKU: IAG-ENG-1213We price match!

In Stock

The Stage 2 Tuff 2.5L Short Block will support up to 600 BHP in the Subaru STI. 
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IAG Stage 2 Tuff EJ25 Short Block Subaru Short Block


  • 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



  • Compression ratio with D cylinder heads: 8.5:1
  • Compression ratio with B, V, and W EJ257 heads with standard thickness gasket: 8.2:1



The IAG Performance Stage 2 Tuff Short Block is a built-short block for those of you that need stronger internals to sustain higher horsepower and higher boost. This short block starts with new 2.5L EJ25 engine case halves that are bored and honed to 99.75mm in-house and are stuffed with IAG-Spec JE 99.75mm coated forged pistons and rings. The pistons are paired with IAG Spec Tuff H-Beam Rods that are connected to a new 2017+ nitride-treated STI crankshaft, and the motor is carefully assembled, balanced, and blueprinted using ARP2000 rods bolts as well as ACL rod and main bearings. 

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 and is rated to 600 BHP. 


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