IAG Performance Subaru Parts & Engine Solutions
Built for reliability and performance on turbocharged Subaru platforms. Trusted upgrades for WRX, STI, and high-power builds.
Engine Blocks & Internals
Short blocks and long blocks engineered for strength, boost, and long-term Subaru reliability.
Air & Oil Management
Air Oil Separators and supporting systems that reduce blow-by and protect turbo Subaru engines.
Reliability First
Performance upgrades designed to solve common Subaru engine failure points before adding power.
Subaru-Specific Design
Components designed specifically for WRX and STI platforms — not adapted from generic parts.
Shop IAG Performance Parts
Browse IAG Performance components by category to find the right solution for your Subaru build.
IAG Short Blocks
Performance-built short blocks engineered to handle increased boost and address common Subaru engine failure points..
IAG Long Blocks
Complete long block solutions for high-horsepower builds, engine replacements, and turnkey Subaru performance setups.
Air Oil Separators
Reduce oil blow-by and protect your engine under boost with IAG air oil separator systems, designed for turbocharged Subaru engines.
Popular IAG Performance Products
These IAG Performance components are frequently chosen by Subaru owners for reliability-focused builds and performance upgrades.
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IAG 550 Long Block Engine w/ IAG 550 Heads for 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Price range: $9,999.99 through $10,299.99 -
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This product has multiple variants. The options may be chosen on the product page
IAG Air / Oil Separator (AOS) For 08-14 Subaru WRX, 08-21 STI, 09-13 FXT, 05-09 LGT & OBXT
$499.99BlackNeon YellowRed
Subaru Engine Guides & Resources
Learn more about Subaru engine reliability and performance upgrades to make informed build decisions.
Achieving a reliable 400whp Subaru STI with the EJ257 engine is one of the most common and proven performance goals in the Subaru community. When done correctly, this power level delivers strong…
Essential Insights for WRX & STI Owners If you drive a Subaru WRX or STI, protecting engine health while preserving performance should always be a priority. One of the most commonly recommended…