Skip to content
Shop By Vehicle
Search

2004-2005 STI Exhaust

Built for your 2004-2005 Subaru WRX STI, this exhaust collection offers a wide selection of premium aftermarket parts designed to enhance your vehicle’s performance and sound. Whether you’re looking to increase horsepower, improve throttle response, or achieve a more aggressive exhaust note, these components deliver noticeable gains and a refined driving experience.

Find everything from catbacks and axle-backs to downpipes and headers, all engineered to fit your STI perfectly. These upgrades not only boost power and exhaust flow but also contribute to the overall reliability and style of your Subaru.

  • Catback exhaust systems for improved flow and sound
  • High-performance downpipes and headers
  • Durable materials for long-lasting performance
  • Precision fitment for 2004-2005 WRX STI models

Shop exhaust upgrades for your Subaru WRX STI at Subimods.

Enhance Your 2004-2005 Subaru STI with Performance Exhaust Upgrades

Upgrading the exhaust system on your 2004-2005 Subaru STI is a key step to unlocking better engine response, increased horsepower, and a more aggressive exhaust tone. Our collection offers a variety of high-quality exhaust components designed specifically for these model years, ensuring optimal fitment and durability for your performance goals.

What does a catback or header upgrade do for your 2004-2005 STI?

Catback exhaust systems replace the piping from the catalytic converter back, improving exhaust flow and reducing weight compared to stock components. Headers, on the other hand, replace the exhaust manifold and help optimize exhaust scavenging right at the engine, which can lead to better throttle response and power gains. Both upgrades contribute to a sportier sound and enhanced driving experience.

  • Improved exhaust flow reduces backpressure for better performance
  • Headers optimize exhaust pulse timing for increased efficiency
  • Catbacks provide a deeper, more aggressive exhaust note
  • Direct-fit designs ensure straightforward installation on your STI

How do downpipes and other exhaust components affect your STI’s performance?

Downpipes connect the turbocharger outlet to the rest of the exhaust system, and upgrading to a high-flow downpipe reduces turbo backpressure and improves spool characteristics. Other components like J-pipes and mid-pipes also influence exhaust flow and sound. Selecting the right combination of parts can enhance power delivery and support future modifications.

Choosing the right exhaust upgrades for your 2004-2005 STI

When selecting exhaust parts, consider your performance goals, sound preferences, and installation ease. Whether you want a full turbo-back system or just a catback for a subtle upgrade, our collection covers trusted brands and quality materials tailored for your STI. Shop our 2004-2005 Subaru STI exhaust parts at Subimods to find the perfect fit for your build.

Shop By Vehicle
Search