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IAG Performance

IAG - Subaru 15-21 WRX - Stage 2 FA20 DIT Subaru Short Block

IAG - Subaru 15-21 WRX - Stage 2 FA20 DIT Subaru Short Block


Regular price $4,199.99 USD
Regular price Sale price $4,199.99 USD
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The IAG Stage 2 short block starts with new Subaru FA 2.0L engine case halves that are machined for improved oiling. Then the case is bored and honed to 86.1mm on our in-house Sunnen SV-30 the most advanced automotive cylinder hone available.

IAG's in-house honing process is able to set piston to wall clearances tighter for a quieter running engine. The short block is measured and assembled using a new 2015-20 Subaru 2.0L WRX crankshaft that is matched to King main bearings. Brian Crower H-Beam rods with ARP2000 rod bolts are utilized along with King or ACL rod bearings. 

The case halves are sealed with new OEM case bolts and sealant. Finally, IAG-Spec 86.1mm forged pistons are spec'd and installed along with an OEM oil plug finishing off the short block.

Power: The IAG Stage 2 Short Block has a power output rating of 600BHP


  • Brand new Subaru OEM Subaru FA20 case halves bored and honed to 86.1mm
  • IAG-Spec 86.1mm Forged Pistons 
  • Brian Crower H-Beam Rods
  • ARP2000 Rod bolts
  • ACL rod and main bearings 
  • New Subaru FA20 DIT WRX crankshaft
  • Standard FHI Subaru case bolts

Stage 2 FA20 Includes:

  • Case Halves -Brand new OEM Subaru FA20 case halves, bored and honed to 86.1mm
  • Case Machining - Modified for improved oiling
  • Case Machining - Bored and honed to 86.1mm
  • Pistons -IAG-Spec 86.1mm Forged Pistons, Ring Set, and .150" x 2.250" Chromoly Wrist Pins.
  • Connecting Rods -Brian Crower H-Beam / ARP2000 Rod Bolts
  • Rod -ACL or King XPG
  • Main Bearings -King XPG
  • Crankshaft -New Subaru FA20 DIT WRX crankshaft
  • Case / Main Bolts -Standard Subaru case bolts
  • Hardware - OEM Oil Plug - comes preinstalled at the oil pan location

Additional Options Available:

  • Oil Plugs & Rear Main Seal - (x1) 11021AA190 Plug, (x2) 11024AA141 Plugs , (x1) 806792010 Rear Main Seal

Compression Ratio:

  • 10.6:1 compression on standard gasket thickness.


  • Subaru 15-21 WRX
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