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IAG Stage 3 EJ25 Closed Deck Case - 11mm H.S.M (No Bore / Hone) - WRX/STI/FXT/LGT

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 deck surface is machined to accept specially CNC’d cast inserts that strengthen the weakest point of the OEM case at the upper sleeve. IAG’s Stage 3 Closed Deck is suitable for street or race use. 

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