Head gasket failure is one of the most common and most expensive outcomes of pushing an EJ-series Subaru beyond its stock limits. In most cases, the failure is not a head gasket…
Wheel studs are not a glamorous upgrade. They do not add horsepower or improve lap times on their own. However, for any Subaru WRX or Subaru STI owner running a wheel and…
The EJ257 in the Subaru STI is a capable engine, but its open-deck architecture has a well-documented ceiling. As boost increases and tuning becomes more aggressive, cylinder wall distortion, head gasket failure,…
The stock Subaru STI turbocharger handles daily driving well, but it runs out of headroom well before most build goals. If the target is 450 to 500 horsepower on an EJ25, the…
The COBB Accessport faceplate is one of the most commonly asked-about COBB accessories for the WRX and STI. Simple to understand, takes seconds to install, and makes a visible difference on a…
The IAG 1150 sits at the top of the IAG closed deck short block lineup. Most owners research it. Fewer actually need it. IAG builds it for extreme power applications where the…
The IAG 950 is the most popular closed deck short block for serious WRX and STI builds. Not because it is the most powerful IAG option, but because it fits the majority…
Clutch Masters is one of the most respected clutch brands in performance driving and one that WRX and STI owners frequently ask about when they outgrow the stock clutch. The FX350 and…
The EJ257 in the STI is one of the most capable engines fitted to a production performance car. It is also one of the most commonly damaged when pushed past its limits…
The fuel pump is one of the most overlooked upgrades on a WRX or STI build until it becomes the restriction point. As power increases and fuel demand rises, the stock pump…
The STI is one of the most capable platforms to build from and one of the most commonly over-built too fast. Owners jump to turbo upgrades and engine work before the bolt-on…
The stock STI turbo is one of the most capable factory turbos fitted to a performance car. It spools quickly, delivers strong mid-range power, and responds well to tune-based gains before needing…
The most expensive mistakes in WRX and STI builds happen before anything goes in the car. Wrong short block for the power goal. Wrong turbo for the platform. Supporting mods skipped because…
The FA24F turbo upgrade market for the 2022 and newer WRX has been limited until now. Most turbo options for the FA24 platform require sourcing components separately and piecing together a kit.…
The FA24 is the engine powering the 2022 and newer Subaru WRX and one of the most common questions from owners planning a build is simple: how much power does it actually…