2015–2021 Subaru WRX Custom HP Tuners Tuning (2.0L Turbo FA20DIT)

Our HP Tuners custom calibrations for the 2015–2021 Subaru WRX are designed to maximize the performance of the 2.0L turbocharged FA20DIT engine. Whether your WRX is stock or equipped with bolt-ons, our in-house tuning improves throttle response, horsepower, torque, and drivability while keeping Subaru reliability intact.

Key Features

• Engine Coverage – 2.0L Turbocharged H4 (FA20DIT) – Subaru WRX (2015–2021, all trims)

• Transmission Support – Calibration available for both 6-speed manual and CVT, refining torque delivery, throttle mapping, and shift strategies

• Custom Calibration – Adjustments available for intakes, downpipes, intercoolers, turbo upgrades, fueling systems, and flex-fuel/E85 conversions

• Safe Performance – Developed with knock-safe ignition strategies, optimized fueling, and smooth daily drivability

• Remote Tuning – Fully supported via HP Tuners MPVI2 and MPVI3 for secure file exchange and flashing

Benefits

• Sharper throttle response and reduced turbo lag

• Noticeable horsepower and torque gains across the RPM band

• Stronger mid-range and top-end acceleration

• Refined drivability for both street and spirited driving

• Reliable calibration for stock and performance-modified WRX builds

Compatibility

Custom tuning is available for:

• 2015–2021 Subaru WRX (2.0L Turbo FA20DIT, 6-speed manual & CVT)

Process

1. Purchase your WRX custom tuning package.

2. Use HP Tuners to read your factory ECU calibration.

3. Provide your stock file and a list of modifications.

4. Receive a calibration built for your exact build.

5. Flash your tune and enjoy immediate improvements.

Professional Assurance

All Subaru WRX calibrations are developed in-house with precision, ensuring safe, consistent, and reliable results. From stock daily drivers to performance builds with upgraded turbos and fueling, our HP Tuners custom tuning delivers proven gains for the FA20DIT platform.

Meta Description (SEO)

Custom HP Tuners tuning for 2015–2021 Subaru WRX 2.0L Turbo FA20DIT. Improve horsepower, torque, throttle response, and drivability with reliable calibrations.