FREE SHIPPING ON ALL ORDERS OVER $199
The Subaru STI has long been a benchmark for turbocharged performance and all-wheel-drive capability. From daily-driven street setups to dedicated track builds, we carry STI-specific parts selected for proper fitment, durability, and real-world performance.
This page is designed to help STI owners from the start of their journey to get the right parts faster, with confidence.
Vehicle-specific fitment. Proven performance brands. Street & track focused upgrades.
Browse Subaru STI aftermarket parts by system to quickly find the upgrades that match your performance goals.
We work with some of the most respected names in the Subaru aftermarket to offer STI parts that deliver consistent performance under demanding conditions. These brands are known for engineering precision, durability, and proven results.
Our Subaru STI parts selection covers multiple generations and configurations, making it easy to find upgrades tailored to your specific model.
2004–2007 Subaru STI
Early EJ257 platform with strong aftermarket support and classic performance roots.
2008–2014 Subaru STI
Wider-body chassis with expanded suspension and drivetrain upgrade potential.
2015–2021 Subaru STI
Refined EJ257 platform with modern chassis updates and track-ready capability.
Always confirm compatibility based on year and configuration before ordering.
Considering the WRX platform? Browse our Subaru WRX Performance Parts page to explore FA20 and FA24-based upgrades.
Looking to better understand your STI platform or plan your next upgrade? These guides break down common performance questions and build considerations.
A built transmission is one of the most debated upgrades in the Subaru world. Some builds break gearboxes early, while others survive years of hard…
Your clutch is basically the “handshake” between the engine and transmission. When it starts slipping, chattering, or feeling inconsistent, it’s usually not random — it’s…
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…
Essential Insights for WRX & STI Owners If you drive a Subaru WRX or STI, protecting engine health while preserving performance should always be a…
Explore some of the most popular Subaru STI upgrades, selected based on performance demand and enthusiast builds.
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This product has multiple variants. The options may be chosen on the product page
Select options
This product has multiple variants. The options may be chosen on the product page
The most impactful starting point for most WRX owners is an Accessport tune combined with a turbo inlet and a supporting exhaust upgrade. These changes improve how the ECU manages boost, reduce restriction at the compressor inlet, and give the build a proper foundation before bigger modifications are added. Our WRX bolt-on upgrades guide covers the right order and what to expect from each mod.
On the FA20, most stock engines reliably support 300 to 330 wheel horsepower with conservative tuning on pump gas. The FA24 in the 2022 and later WRX follows a similar pattern with slightly more low-end torque from the factory. Exceeding these thresholds without supporting mods increases the risk of head gasket failure and bottom end stress. Our FA20 and FA24 power limits guide breaks this down in detail.
The FA20 powered the WRX from 2015 to 2021 and has a deep aftermarket ecosystem with proven tuning paths. The FA24 arrived in the 2022 WRX with increased displacement, stronger low-end torque, and updated engine management. Both respond well to bolt-on modifications and tuning, but the FA24 is a newer platform with a growing aftermarket. Our FA20 vs FA24 guide covers the key differences in detail.
Once power goals push consistently beyond 350 to 400 wheel horsepower on sustained hard use, the factory open deck architecture starts to show its limits. At that point a closed deck short block becomes the smarter long-term foundation. Our WRX engine build and power goals guide explains how to plan around a built engine from the start.
It depends on the modification. Bolt-on upgrades like a catback exhaust, turbo inlet, or air intake can often be installed by experienced DIYers. Fuel system upgrades, turbo swaps, and engine builds require professional installation and tuning to operate safely. Wrench Masters offers installation and tuning services for WRX builds at our St. Petersburg location.
Yes. We offer free shipping on orders over $199 across the continental United States. All orders are processed and shipped from our St. Petersburg location.
Vehicle-specific fitment. Proven performance brands. Street & track focused upgrades.
