Best FA20 Engine Performance Mods: Stage 2 Setup for Subaru WRX and Crosstrek

The Subaru WRX and Crosstrek, equipped with the FA20 engine, are popular choices among car enthusiasts seeking a balance of performance and daily usability. To enhance the performance of these vehicles, a Stage 2 setup is often recommended. This article explores the best performance modifications for the FA20 engine, focusing on achieving optimal power and efficiency.

Understanding Stage 2 Modifications

Stage 2 modifications typically build upon the foundation set by Stage 1 upgrades. These enhancements usually require additional supporting modifications to maximize performance and reliability. For the FA20 engine, Stage 2 involves a combination of tuning, exhaust upgrades, and intake enhancements.

Key Performance Mods for Stage 2 Setup

• ECU Tune: The first step in a Stage 2 setup is a proper ECU tune. This allows for increased boost levels and optimized fuel maps.
• High-Performance Exhaust System: Upgrading to a cat-back exhaust system improves exhaust flow and reduces back pressure.
• Cold Air Intake: A cold air intake system enhances airflow to the engine, improving throttle response and power output.
• Upgraded Intercooler: A larger intercooler helps reduce intake temperatures, allowing for more efficient combustion.
• Boost Controller: An electronic boost controller allows for precise management of boost levels, enhancing performance.

1. ECU Tune

The ECU tune is arguably the most critical modification in a Stage 2 setup. It recalibrates the engine’s parameters to accommodate the increased airflow and boost pressure from other mods. Popular tuning solutions include:

• Accessport by COBB Tuning
• Open Source Tuning with EcuTek
• VersaTune for customizable options

2. High-Performance Exhaust System

A high-performance exhaust system is essential for improving exhaust flow. A cat-back system not only enhances sound but also contributes to power gains. Consider the following options:

• Invidia Q300 Cat-Back Exhaust
• HKS Hi-Power Exhaust System
• Remark Axle-Back Exhaust

3. Cold Air Intake

A cold air intake allows the engine to breathe better by providing cooler, denser air. This modification is crucial for maximizing power output. Some popular options include:

• K&N 69 Series Typhoon Intake
• COBB SF Intake System
• AEM Cold Air Intake System

4. Upgraded Intercooler

Upgrading the intercooler is vital for maintaining performance under boost. A larger intercooler reduces the temperature of the intake air, leading to denser air and improved combustion. Recommended options include:

• Process West Verticooler
• GrimmSpeed Front Mount Intercooler
• ETS Front Mount Intercooler Kit

5. Boost Controller

A boost controller allows for precise management of boost levels, ensuring optimal performance and reliability. Electronic options provide more control and are easier to adjust. Consider these products:

• GrimmSpeed Electronic Boost Controller
• HKS EVC Boost Controller
• AEM Tru-Boost Controller

Additional Considerations

While the above modifications are essential for a Stage 2 setup, there are additional considerations to keep in mind:

• Fuel Upgrades: Consider using higher octane fuel to prevent knock and maximize performance.
• Upgraded Fuel Pump: A high-flow fuel pump ensures adequate fuel delivery under increased demand.
• Suspension Upgrades: Enhancing suspension components improves handling and stability at higher speeds.

Conclusion

Achieving a Stage 2 setup for the FA20 engine in your Subaru WRX or Crosstrek involves a combination of essential performance modifications. By focusing on the ECU tune, exhaust system, cold air intake, intercooler, and boost controller, you can unlock significant power and efficiency. Always ensure that your modifications are complemented by proper maintenance and tuning to enjoy the full benefits of your performance upgrades.