Closed-Deck Long Block Engine

The IAG Performance IAG-ENG-4015W is a new, hand-built, closed-deck long block engine designed for EJ25 Subaru engines. Its construction makes it a robust option for demanding applications. As a new product, the IAG-ENG-4015W offers a fresh start for builds requiring a reliable and powerful engine foundation. The closed deck design is a key feature for enthusiasts looking to push the limits of their EJ25 platform. This engine serves as a critical component for performance-oriented Subaru vehicles. Based on available information, this engine is associated with IAG 700 and 750 Closed Deck Long Block Engine models, often paired with Stage 3 Heads. It is listed as compatible with 2008-2021 STI models, as well as 2004-2006 STI models, depending on the specific configuration or bundle. It is recommended to verify exact fitment for your specific vehicle year and model.