Introduction: Unlocking Your FA24-Powered BRZ

The Subaru BRZ entered its second generation with the FA24 engine, a 2.4-liter naturally aspirated boxer that delivered a welcome bump in displacement over the previous FA20. Factory output sits at 228 horsepower and 184 lb-ft of torque, a solid foundation that leaves clear room for improvement. For many owners, a threshold of 250 wheel horsepower (whp)—or roughly 290 crank horsepower—represents a natural and achievable target using bolt-on modifications. This goal improves straight-line response without sacrificing reliability or daily drivability.

Reaching 250 whp on the FA24 requires a coordinated set of upgrades. The engine responds well to improved airflow, optimized fuel mapping, and reduced driveline loss. Below we break down every cost, every part, and every consideration needed to build a proven 250 whp FA24 BRZ.

What Are “Tier 1” Modifications?

Tier 1 modifications are bolt-on upgrades that do not require internal engine work, forced induction, or major fabrication. They are designed to be installed with hand tools in a home garage and to work together harmoniously. For the FA24, Tier 1 parts focus on three areas:

  • Intake and exhaust path improvements – reducing restriction to let the engine breathe freely
  • Fuel and ignition optimization – ensuring the engine can safely utilize the extra air
  • Engine calibration – a custom tune that ties everything together

When chosen and matched correctly, these components push the FA24 past the 250 whp mark while retaining factory-level reliability.

Common Tier 1 Upgrades for the BRZ FA24

  • Cold air intake (CAI)
  • Cat-back or axle-back exhaust
  • Front pipe and/or header (often grouped as “exhaust system”)
  • ECU reflash or plug-in tuner
  • Upgraded spark plugs
  • Oil cooler (optional for sustained track use)

Detailed Cost Breakdown of Each Modification

All prices listed reflect average retail costs in 2025 USD. Installation labor is not included because many enthusiasts perform the work themselves. If you hire a shop, add $50–$150 per hour depending on the job.

1. Cold Air Intake ($250 – $400)

A high-flow cold air intake replaces the restrictive factory airbox and paper filter. The FA24 responds particularly well to intakes that maintain laminar airflow and include a heat shield to keep intake air temperatures low. Options from Grimmspeed, Perrin, and COBB are proven on the FA24. Expect to spend roughly $320 on a quality kit. A dry-flow filter is preferred over oiled units to avoid MAF sensor contamination.

2. Cat-Back Exhaust System ($600 – $900)

A cat-back exhaust reduces backpressure and adds a sporty note. For power gains, a 3-inch diameter system is ideal. The mid-pipe and muffler design affect both tone and flow. Brands like FT86 Speed Factory and Borla offer systems that pair well with the FA24. Budget $750 for a high-quality cat-back. If you also swap the front pipe or header, the total exhaust investment can exceed $1,000, but for 250 whp a cat-back alone is sufficient when combined with a tune.

3. Front Pipe and Header ($400 – $1,200)

The front pipe and header are the most restrictive sections of the exhaust on a stock FA24. A catted or catless front pipe reduces backpressure and improves spool of the naturally aspirated engine. An aftermarket header with equal-length or unequal-length runners can add 10–15 whp with a tune. A combined header and front pipe kit from manufacturers like ACE Engineering or JDL Auto Design runs $900–$1,100. For a strict 250 whp goal, a high-flow front pipe ($400) is often prioritized before a full header swap, but the header provides the largest single gain.

4. ECU Tune ($400 – $600)

No power figure is achievable without a calibration that matches the hardware. A custom e-tune from a reputable tuner like Zachary Performance or a remote dyno tune via platforms like EcuTek costs roughly $500. Some owners choose a plug-and-play device like the COBB Accessport V3, which offers off-the-shelf maps plus data logging. The Accessport itself costs about $675, and a custom tune adds another $200–$400. For the best results, a dyno tune is recommended.

5. High-Performance Spark Plugs ($80 – $120)

Factory plugs can handle mild increases in cylinder pressure, but a one-step colder plug (e.g., NGK LFR6AIX-11) improves knock resistance and ignition consistency under the higher cylinder pressures created by the modifications. A set of four plugs costs roughly $100. The installation is straightforward and should be performed during the tuning process.

6. Supporting Mods (Oil Cooler, $400 – $700 – Optional)

While not strictly required for 250 whp under street driving, an oil cooler becomes highly recommended if you plan to autocross or track the car. The FA24 runs hot in sustained high-RPM use. A quality thermostatic oil cooler kit from Mishimoto or Setrab costs about $550. This modification is not mandatory for a street-only 250 whp build, but it protects your engine investment.

Total Cost Estimate

Summing the core components needed to reach 250 whp on a BRZ FA24:

  • Cold air intake: $320
  • Cat-back exhaust: $750
  • Front pipe/header (header swap for best results): $1,000
  • ECU tune: $500
  • High-performance spark plugs: $100
  • Oil cooler (optional): $550

Total (core mods, no oil cooler): $2,670
Total with oil cooler: $3,220

This is higher than the original article’s estimate because we include a header swap, which is necessary to consistently hit 250 whp on a naturally aspirated FA24. Many dyno reports from the community show that a CAI, cat-back, and tune alone land around 235–240 whp. Adding a front pipe and header pushes the final number to 250–260 whp, depending on the dyno.

Where the Power Comes From: Dyno Results

Real-world dyno testing on a stock FA24 BRZ shows approximately 205–210 whp (drivetrain loss around 8–12%). With the modifications listed above and a proper tune, owners report the following typical gains:

  • Stock: 208 whp
  • + CAI + Tune: 220 whp
  • + Cat-back + Front pipe: 233 whp
  • + Header + Tune: 248–258 whp

The header and tune combination accounts for the largest single gain. It is the most expensive single part but also the most rewarding. The key is that each modification builds on the others; the tune must be recalibrated after each change to unlock the full potential.

Installation Considerations and DIY vs. Professional

All Tier 1 parts listed can be installed with basic hand tools and a jack and jack stands. The cold air intake and spark plugs take about 1–2 hours. The cat-back exhaust is a bolt-on job requiring 1–3 hours. The front pipe and header are more involved, especially on the FA24 with limited clearance near the oil pan; expect 4–6 hours for a first-timer. If you lack the confidence or tools, a shop will charge $400–$800 in labor for the header and front pipe install.

Warranty and Reliability Considerations

Modifications can void factory warranty coverage for related failures. An intake and cat-back alone rarely cause dealer pushback, but a header and tune are immediately visible during a scan. Consider keeping your stock parts and reverting to them if warranty service is needed. Reliability-wise, the FA24 is robust when tuned correctly. Using a reputable tuner and quality parts ensures the engine runs within safe parameters. Avoid cheap “ebay” parts that may have poor fitment or restrictive designs.

Tips for Saving Money Reaching 250 Whp

  • Buy used parts – The BRZ community frequently parts out cars or upgrades. Check forums like ft86club.com and Facebook groups for intakes, cat-backs, and even headers at 30–50% off retail.
  • Self-tune with a wideband – If you have experience, you can use software like RomRaider or EcuFlash to adjust tables yourself, but the risk of engine damage is high. Safer: pay for a remote e-tune that provides revision logs.
  • Skip the cold air intake – Some tuners report that the stock airbox with a high-flow filter and a removed intake silencer flows nearly as well as an aftermarket CAI. This can save $250–$300 but may yield 2–3 whp less.
  • Choose a cat-back over a full exhaust – A cat-back with a high-flow front pipe can deliver 90% of the gain of a header at half the cost if you stop at 240 whp. To reach 250, you need the header.

External Resources for Further Reading

Conclusion: Is 250 Whp Worth It?

For an all-in cost around $2,600–$3,200 (parts only), a Tier 1 build that delivers 250 whp transforms the BRZ’s character. It pulls harder from 4,000 RPM to redline, feels genuinely quick on the street, and still returns 28–30 mpg highway if you stay out of boost. The process is straightforward, the parts are well-documented, and the community support is extensive. Whether you are a weekend warrior or a track-day enthusiast, this power level is the sweet spot for a naturally aspirated FA24. Start with a good tune and build from there — your BRZ will thank you.