Upgrading the Exhaust System for Wrx E85 Conversion: Maximize Power and Sound

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The Subaru WRX is a beloved vehicle among car enthusiasts, known for its impressive performance and rally heritage. When converting your WRX to run on E85 fuel, upgrading the exhaust system is essential to maximize power and sound. This article will guide you through the process of selecting and installing an upgraded exhaust system that complements your E85 conversion.

Understanding E85 Fuel and Its Benefits

E85 is a high-octane fuel blend containing up to 85% ethanol and 15% gasoline. This fuel type offers several advantages for performance vehicles like the WRX:

  • Higher octane rating: E85 has a higher octane rating than regular gasoline, allowing for more aggressive tuning and increased horsepower.
  • Improved cooling: Ethanol has a cooling effect in the combustion chamber, which can help reduce the risk of knock.
  • Environmental benefits: E85 produces fewer greenhouse gas emissions compared to traditional fuels.

Why Upgrade the Exhaust System?

Upgrading the exhaust system is crucial for several reasons when converting to E85:

  • Increased exhaust flow: A performance exhaust system reduces back pressure, allowing the engine to expel exhaust gases more efficiently.
  • Enhanced sound: An upgraded exhaust system can significantly improve the sound of your WRX, providing a more aggressive tone that matches its performance.
  • Weight reduction: Many aftermarket exhaust systems are lighter than stock options, contributing to better overall performance.

Choosing the Right Exhaust System

When selecting an exhaust system for your WRX E85 conversion, consider the following factors:

  • Material: Stainless steel is a popular choice due to its durability and resistance to corrosion. Mild steel is less expensive but may not last as long.
  • Type of exhaust: Options include cat-back systems, turbo-back systems, and axle-back systems. Each type has different benefits depending on your performance goals.
  • Sound level: Consider whether you prefer a loud, aggressive sound or a more subdued tone. Many manufacturers provide sound clips for comparison.

Here are some popular exhaust systems that are well-suited for WRX E85 conversions:

  • Invidia Q300: Known for its deep tone and excellent performance, this cat-back system is a favorite among WRX owners.
  • HKS Hi-Power: This system offers a unique sound and is designed for optimal performance, making it a great choice for E85 setups.
  • Greddy SP Elite: With a focus on both performance and sound, this exhaust system provides a balanced option for daily drivers and enthusiasts alike.

Installation Process

Installing an upgraded exhaust system can be a straightforward process if you follow these steps:

  • Gather tools: You’ll need basic hand tools, a jack, and jack stands for safety.
  • Remove the old exhaust: Start by loosening the clamps and bolts holding the stock exhaust in place. Remove it carefully to avoid damaging any components.
  • Install the new exhaust: Follow the manufacturer’s instructions to install the new system, ensuring all connections are secure.
  • Check for leaks: After installation, start the engine and check for any exhaust leaks. Tighten connections as needed.

Tuning for E85 and Exhaust Upgrades

After upgrading your exhaust system, it’s essential to tune your WRX for E85 fuel. This process ensures that your engine runs optimally with the new fuel and exhaust setup:

  • ECU remapping: A proper tune will adjust fuel maps, ignition timing, and other parameters to maximize performance.
  • Wideband O2 sensor: Installing a wideband O2 sensor can help monitor air-fuel ratios, ensuring your engine runs efficiently.
  • Datalogging: Use datalogging software to track performance and make adjustments as needed.

Conclusion

Upgrading the exhaust system for your WRX E85 conversion is a crucial step in maximizing power and sound. By choosing the right components and ensuring proper installation and tuning, you can enhance your vehicle’s performance and enjoy the benefits of E85 fuel. Whether you’re a daily driver or a dedicated enthusiast, an upgraded exhaust system will elevate your WRX experience.