Short Blocks & Internals

Shop Subaru short blocks and internal engine parts at IAG Performance for 2002–2023 Subaru WRX, STI, Legacy GT, and Forester XT models. Our selection includes high-quality Subaru engine internals designed for EJ20 and EJ25 engines, making it easy to complete everything from routine engine repairs to full Subaru WRX and STI engine rebuilds. Browse a wide range of Subaru short blocks and internal engine components including forged pistons, connecting rods, crankshafts, engine bearings, case halves, and other critical bottom-end parts. Whether you're rebuilding a factory EJ25 engine, upgrading to stronger forged internals, or planning a high-horsepower Subaru engine build, these components provide the strength, durability, and reliability needed for both street and track applications. IAG Performance offers complete Subaru short blocks along with the internal engine parts required to support a reliable rebuild or performance upgrade. From forged pistons and performance rods to crankshafts, bearings, and engine cases, our inventory includes the parts Subaru owners trust when building WRX and STI engines. We carry Subaru engine internals from many of the most respected brands in the performance industry, including ACL, Brian Crower, CP Pistons, Carrillo, Clevite, Eagle, IAG Performance, JE Pistons, K1 Technologies, Killer B Motorsport, King Engine Bearings, Manley Performance, and Subaru OEM components. Whether you're repairing a damaged engine, refreshing a high-mileage motor, or building a fully forged Subaru short block for serious power, IAG Performance provides the engine internals and components needed to support your WRX, STI, Legacy GT, or Forester XT engine build.