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The Subaru Legacy GT is known for its impressive performance and reliability. However, many enthusiasts seek to enhance its capabilities even further. One popular method to achieve significant power gains is through performance modifications, particularly with the Cobb Stage 2 tune. This article explores various performance mods that can help you achieve over 50 horsepower gains on your Subaru Legacy GT.
Understanding the Cobb Stage 2 Tune
The Cobb Stage 2 tune is a comprehensive engine management solution designed to optimize the performance of the Subaru Legacy GT. By adjusting the engine’s fuel maps, timing, and boost levels, this tune allows for a more aggressive performance profile, resulting in substantial horsepower and torque increases.
Key Performance Mods for Subaru Legacy GT
To maximize the benefits of the Cobb Stage 2 tune, several performance modifications can be implemented. Below are some of the most effective upgrades:
- Cold Air Intake: Replacing the factory air intake system with a high-performance cold air intake allows for improved airflow to the engine, enhancing combustion efficiency.
- Cat-Back Exhaust System: Upgrading to a cat-back exhaust system reduces back pressure and improves exhaust flow, which can result in a more aggressive sound and increased power.
- Downpipe: A high-flow downpipe is essential for maximizing turbo efficiency. This mod allows for quicker spool times and improved turbo response.
- Intercooler Upgrade: An upgraded intercooler helps to reduce intake temperatures, allowing for denser air and better performance under boost.
- High-Performance Spark Plugs: Installing high-performance spark plugs ensures a more reliable ignition, which is crucial for maximizing power output.
Installation Process
Installing these performance mods can vary in complexity. Here’s a general overview of the installation process for each component:
Cold Air Intake
1. Begin by removing the factory air intake system.
2. Install the new cold air intake, ensuring all connections are secure.
3. Reconnect any sensors and check for leaks.
Cat-Back Exhaust System
1. Lift the vehicle and support it securely.
2. Remove the existing exhaust system from the catalytic converter back.
3. Install the new cat-back exhaust system, ensuring proper alignment and secure fastening.
Downpipe
1. Access the downpipe by removing any necessary components (like the heat shield).
2. Disconnect the factory downpipe from the turbo and exhaust system.
3. Install the new downpipe, ensuring all gaskets and bolts are properly tightened.
Intercooler Upgrade
1. Remove the factory intercooler and associated piping.
2. Install the new intercooler, ensuring all connections are secure.
3. Reconnect any sensors and check for leaks.
High-Performance Spark Plugs
1. Remove the ignition coils and factory spark plugs.
2. Install the new high-performance spark plugs, ensuring proper gap settings.
3. Reinstall the ignition coils and ensure all connections are secure.
Tuning Your Legacy GT
After installing the performance mods, the next step is to tune your vehicle using the Cobb Accessport. This handheld device allows you to upload the Stage 2 map tailored to your specific modifications.
Steps to Tune
- Connect the Accessport to your vehicle’s OBD-II port.
- Follow the on-screen instructions to select the appropriate map for your modifications.
- Upload the tune and allow the Accessport to complete the process.
- Once completed, disconnect the Accessport and start your vehicle to ensure everything is functioning correctly.
Testing Performance Gains
After completing the modifications and tuning, it’s essential to test the performance gains. This can be done using a dynamometer (dyno) to measure horsepower and torque before and after the modifications.
Expected Gains
With the Cobb Stage 2 tune and supporting modifications, you can expect to see gains of over 50 horsepower, depending on the specific setup and tuning. Many Legacy GT owners report significant improvements in throttle response and overall driving enjoyment.
Conclusion
Enhancing the performance of your Subaru Legacy GT is an exciting journey that can lead to impressive gains in horsepower and driving experience. By implementing the right performance mods and utilizing the Cobb Stage 2 tune, you can unlock the full potential of your vehicle. Always ensure that modifications are done professionally and that tuning is performed correctly to achieve the best results.