If you are comparing the FA20 and FA24 engines found in modern Subaru WRX models, you are not alone. With the introduction of the FA24 in the 2022 WRX, many owners are wondering how it compares to the earlier FA20, especially when it comes to reliability, tuning, and modification potential.
This guide breaks down the key differences in simple terms to help you understand what sets these engines apart and which one may better fit your goals.
FA20 Overview (2015–2021 WRX)
The FA20DIT powered the WRX from 2015 through 2021. It is a 2.0-liter turbocharged, direct-injected engine that quickly became popular thanks to its strong aftermarket support and proven tuning platforms.
Over the years, the FA20 has been extensively modified, tuned, and rebuilt by enthusiasts and shops alike, making it one of the most well-understood modern Subaru engines.
Why the FA20 Is Still Popular
- Large aftermarket support with proven parts
- Well-documented tuning strategies
- Wide range of short block and long block options
- Strong community knowledge around common upgrades
FA24 Overview (2022+ WRX)
The FA24DIT debuted in the 2022 WRX as a 2.4-liter turbocharged engine. While it shares the FA family name, it brings notable changes, including increased displacement and a different torque delivery compared to the FA20.
From the factory, the FA24 focuses more on low-end torque and drivability rather than peak horsepower, which changes how the car feels in everyday driving.
What Makes the FA24 Different
- Larger displacement for improved low-RPM torque
- Smoother power delivery in stock form
- Newer platform with growing aftermarket support
- Different tuning considerations compared to the FA20
Reliability and Daily Driving
Both the FA20 and FA24 can be reliable daily drivers when properly maintained and tuned. The key factor is not the engine itself, but how modifications are planned and executed.
The FA20 has the advantage of time. Common weak points, safe power levels, and supporting modifications are well understood. The FA24, while newer, has shown promising reliability so far, especially for lightly modified daily-driven setups.
Modding and Tuning Differences
From a modification standpoint, the FA20 offers more immediate options simply due to the depth of available parts and long-term tuning data.
That said, the FA24 is quickly catching up. Flex fuel upgrades and tuning solutions are already available, and engine build options are beginning to expand.
Examples of common upgrade paths include:
- FA20 Flex Fuel Upgrades for 2015–2021 WRX models
- FA24 Flex Fuel Upgrades for 2022+ WRX models
Engine Build and Upgrade Options
When it comes to internal engine upgrades, the FA20 currently has far more established options. Built short blocks and long blocks are widely available for a range of power goals.
The FA24 is newer to the performance market, but high-power solutions are already emerging for owners planning more serious builds.
Which Engine Is Right for You?
If you already own a 2015–2021 WRX, the FA20 remains a strong platform with excellent aftermarket support and proven reliability when modified correctly.
If you are considering a newer WRX or already own a 2022+ model, the FA24 offers improved drivability and torque, with an aftermarket that continues to grow.
In both cases, proper planning, quality parts, and professional tuning matter far more than the engine choice itself.
Frequently Asked Questions
Is the FA24 more reliable than the FA20?
It is still too early to make long-term conclusions. Both engines can be reliable when maintained and tuned properly.
Is the FA20 easier to modify?
Yes. The FA20 currently has more proven modification paths and engine build options.
Can the FA24 handle high power?
Built FA24 engines are already available, and early results are promising, but the platform is still evolving.
Does tuning matter more than engine choice?
Absolutely. A conservative, well-supported tune is critical for long-term reliability on both platforms.
Need Help Planning Your WRX Build?
Whether you are modifying an FA20 or FA24 WRX, choosing the right parts and upgrade path from the start can save time and money.
If you have questions about compatibility, power goals, or reliability, Wrench Masters can help you plan a setup that fits your needs.
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