Case Halves

Please Note: Overbore must be performed (99.75mm is the preferred bore) before assembly!IAG's Stage 3 Closed Deck converted case halves were created to be the most affordable, cost-effective short block modification for the Subaru EJ25 turbo engines. The...

IAG's Stage 3 Closed Deck converted case halves were created to be the most affordable, cost-effective short block modification for the Subaru EJ25 turbo engines. The deck surface is machined to accept specially CNC'd cast inserts that strengthen the...

Please Note: Overbore must be performed (99.75mm is the preferred bore) before assembly!IAG's Stage 3 Closed Deck converted case halves were created to be the most affordable, cost-effective short block modification for the Subaru EJ25 turbo engines. The...

IAG's Closed Deck converted case halves were created to be the most affordable and cost-effective short block modification for EJ25 Subaru turbo engines. The deck surface is machined to accept specially CNC'd cast inserts that strengthen the weakest...

Please Note: Overbore must be performed (99.75mm is the preferred bore) before assembly!IAG's Stage 3 Extreme Closed Deck converted case halves were created to be the most affordable, cost-effective short block modification for the Subaru EJ25 turbo...

IAG's Closed Deck converted case halves were created to be the most affordable and cost-effective short block modification for EJ25 Subaru turbo engines. The deck surface is machined to accept specially CNC'd cast inserts that strengthen the weakest...

Please Note: Overbore must be performed (99.75mm is the preferred bore) before assembly!IAG's Stage 3 Magnum Closed Deck converted case halves were created to be the most affordable and cost-effective short block modification for EJ25 Subaru turbo...

IAG's Stage 3 Magnum Closed Deck converted case halves were created to be the most affordable and cost-effective short block modification for EJ25 Subaru turbo engines. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept...

Please Note: Overbore must be performed (99.75mm is the preferred bore) before assembly!IAG's Stage 4 Tuff Closed Deck EJ25 converted case halves are the most cost-effective short block modification for high horsepower Subaru WRX and STI's. IAG machines...

The Stage 4 Tuff is one of IAG's strongest and most prepared EJ25 Closed Deck offering. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that transform the block into a solid deck. The...

The Stage 4 Extreme is IAG's strongest and most prepared EJ25 Closed Deck offering. The case halves are split and the main webs are CNC machined in our Haas VF-4SS CNC mill for 9.5mm pins to reduce distortion and movement of the case in extreme...

Using the same world-leading technology found in Willall's incredible billet GT-R block, the billet EJ case seeks to change the Subaru performance tuning market by reinventing the EJ and addressing virtually every weakness that exists in max-power builds...

Subaru OEM 2.5L EJ25 Case Half Set. This is the foundation for building a EJ25 engine as is often used if the original case cannot be bored out or is cracked. *Note 2002-05 Subaru WRX models require additional parts and tuning when upgrading to 2.5L...