IAG Stage 2 2.5L Subaru Short Block

2015-2021 Subaru STI

Ships for free in the 48 states


Only 3 left!

The Stage 2 Short Block features forged pistons to handle up to 575 BHP in the Subaru STI. 


IAG Stage 1 EJ25 Subaru Short Block


  • Brand new Subaru OEM case halves bored and honed in-house to 99.5mm
  • IAG-Spec JE 99.5mm Forged Pistons and Ring set
  • .180" Chromoly steel pins, clips along with coated skirts and offset wrist pins
  • IAG-Spec H-Beam Rods
  • ARP2000 Rod bolts
  • ACL rod and main bearings 
  • New Subaru Nitride Treated 2017+ STI crankshaft
  • Standard FHI Subaru case bolts
  • Rated to 575 BHP



  • 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 Short Block is a built-short block for those of you that need stronger internals to sustain higher horsepower and higher boost. Like IAG's Stage 1 Short Block, this short block starts with new EJ25 case halves that are stuffed with IAG-Spec JE 99.5mm forged piston and rings. The pistons are paired with IAG-Spec H-Beam Rods that are connected to a new 2017+ STI nitride-treated 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 575 BHP. 



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