Headers form an integral component in improving the performance of turbocharged engines, such as those Subaru offers in their WRX line. As far as the 2002-2006 model of Subaru WRX remains one of the most prized models of the enthusiasts’ world, exhaust headers can drastically upgrade the power delivery and drivability. This article features the options, advantages, and disadvantages of aftermarket Subaru WRX headers for this period as well as general Subaru 2002-2006 WRX headers.
What Are Exhaust Headers?
Exhaust headers replace the factory exhaust manifold, a device that collects exhaust gases from the engine’s cylinders. Performance headers are engineered to improve exhaust flow, reduce backpressure, and increase engine efficiency. These upgrades are particularly valuable for turbocharged vehicles, where better exhaust flow can improve turbo spool and overall power output.
2002-2006 Subaru WRX Headers
One of the most popular tuners is the 2002-2006 Subaru WRX with the EJ20 turbocharged flat-four engine. The boxer configuration of this engine provides for an exhaust note that many know as the “Subaru rumble.”
Advantages of Upgrading WRX Headers
Improved Turbo Response: Aftermarket headers maximize exhaust gas flow to the turbocharger, thus delivering a faster spool time and minimizing turbo lag.
More Power: Improved exhaust efficiency can release extra horsepower and torque, especially when combined with other supporting modifications such as a downpipe or an ECU tune.
Heat Resistance: Aftermarket exhaust headers are more resistant to cracking and heat fatigue than their stock counterpart, which tends to be made of rather inferior stainless steel.
Short V. Long Headers
Unequal-Length Headers (UEL): These are a favorite of Subaru enthusiasts as they preserve the characteristic Subaru rumble. These headers create an imbalance in the exhaust pulses, which makes the exhaust sound unique. They do have a small performance penalty over equal-length designs at the peak.
Equal-Length Headers (EL): These headers have been designed to be as efficient as possible. They offer better exhaust flow, which provides better top-end power, and reduces spool time. However, they have a less desirable sound as compared to the classic Subaru exhaust.
Subaru WRX Headers: General Considerations
The upgrade of the headers is not only a 2002-2006 WRX but all the generations of WRX. Subaru’s turbocharged engines, such as the EJ25 and FA20, have greatly benefited from improved exhaust systems.
Benefits of Subaru WRX Headers:
Boost Efficiency: Performance headers allow the engine to expel exhaust gases more efficiently, freeing up horsepower.
Support for Modifications: For highly modified WRXs with larger turbos or higher boost levels, headers can support higher airflow and reduce thermal stress.
Customization Options: Available in various materials and designs, headers can be tailored to specific builds and performance goals.
Installation and Compatibility:
Headers for the 2002-2006 WRX often need supporting modifications, such as upgraded gaskets or heat shielding, to ensure reliability.
Some aftermarket headers require tuning to maximize the performance gains and prevent overboost or uneven air-fuel ratios.
Choosing the Right Headers
When selecting headers for your WRX, consider your performance goals and budget. Unequal-length headers are ideal for enthusiasts who want to preserve the Subaru rumble, while equal-length headers suit those prioritizing peak performance. Additionally, ensure compatibility with your turbo setup, as certain headers are optimized for specific configurations.
Conclusion
Headers are a transformative upgrade to the 2002-2006 Subaru WRX headers or any other WRX models. Whether you chase an iconic sound or maximum power gains, selecting the best headers can significantly enhance your Subaru’s performance. Headers complement other modifications, so there is nothing holding back turbocharged WRX’s capability to provide you with something thrilling to drive.
