The FA24-powered WRX (2022-present) brought Subaru’s new 2.4-liter turbocharged boxer engine to the masses, offering a stout starting point for performance upgrades. While the factory output is respectable, the aftermarket has quickly developed a wide range of modifications that unlock significant gains. Before diving into bolt-ons, understanding the true cost of each upgrade—including parts, labor, and supporting modifications—is essential for building a reliable, powerful car without overspending. This article provides a detailed cost breakdown of performance mods for the FA24 WRX, from the first intake upgrade all the way to a full exhaust system.

Introduction to Performance Mods

Performance modifications for the FA24 WRX can be divided into categories that improve airflow, cooling, fueling, and engine management. Each modification yields varying horsepower and torque increases, but the cost-to-benefit ratio changes dramatically depending on the parts selected and whether you install them yourself or hire a shop. A carefully planned build can deliver excellent power per dollar, while a haphazard approach often leads to wasted money and reliability concerns. This guide focuses on the most common upgrades—intake, intercooler, turbocharger, exhaust, and tuning—along with supporting modifications like suspension and brakes to handle the extra power.

Cost Breakdown of Performance Mods

1. Intake Systems

Upgrading the intake system is often the first modification WRX owners consider. The FA24 engine uses a mass airflow (MAF) sensor, so aftermarket intakes can trigger check engine lights or cause fuel trims to wander if not paired with a tune. However, with a proper calibration, a high-flow intake reduces restriction and can produce 10–20 wheel horsepower on a stock turbo setup.

  • Cost: $200 – $500
  • Variations: Dry vs. oiled filters, metal vs. plastic intake tubes, boxed vs. open designs. Entry-level options (e.g., K&N drop-in filter in stock box, about $60) offer minimal gains. Full intake kits from brands like Cobb, Perrin, or ETS range from $350 to $500.
  • Installation: DIY – 30 minutes to 1 hour. Professional install $75–$150.
  • Benefits: Improved throttle response, louder turbo spool and blow-off sounds, 5–20 hp depending on other mods and tuning.
  • Considerations: Without a tune, a cold-air intake may actually lose power or cause lean conditions. Most reputable tuners recommend tuning after any intake swap. Some intakes require recalibrating the MAF sensor scaling, adding to dyno or etune costs.

2. Intercooler Upgrades

For those looking to maximize performance, upgrading the intercooler is vital. The FA24 WRX comes with a top-mounted intercooler (TMIC) that suffers from heat soak during aggressive driving. A larger front-mount intercooler (FMIC) or a bar-and-plate TMIC can reduce intake air temperatures, allowing more timing advance and higher boost safely.

  • Cost: $600 – $1,200 for TMIC replacements; $1,000 – $1,800 for FMIC kits
  • Variations: TMIC – easier installation, retains stock piping routing but may have less cooling capacity. FMIC – better cooling, more piping complexity, often requires cutting the bumper beam or modifying the front bumper support.
  • Installation: TMIC – DIY 2–3 hours. FMIC – DIY 4–6 hours or professional $400–$700.
  • Benefits: Lower intake temperatures by 20–50°F, reduced heat soak, consistent power on track or in warm climates. Typical power gain with tune: 10–30 whp depending on turbo upgrade.
  • Considerations: FMIC increases turbo lag slightly due to larger volume, but this is often offset by denser air. For a daily driver, a high-quality TMIC may be sufficient and more cost-effective.

3. Turbocharger Upgrades

For substantial power gains, upgrading the turbocharger is the single most impactful modification. The stock FA24 turbo is small and spools quickly but runs out of breath past 4,800 rpm. Larger turbos like the Garrett G series or BorgWarner offerings can push well over 500 whp with proper supporting mods.

  • Cost: $1,500 – $3,500 for the turbo itself; budget an additional $500–$1,000 for associated components (oil feed/return lines, gaskets, heat shielding, upgraded wastegate, etc.)
  • Variations: Drop-in hybrids (e.g., FP Blue, IAG Stage 2) retain stock location and use a larger compressor wheel – $1,500–$2,500. Full frame turbos requiring custom headers and piping – $2,500–$3,500+.
  • Installation: DIY 6–10 hours for drop-in; professional $800–$1,500. Full frame installations are significantly more labor-intensive.
  • Benefits: 400–600+ whp potential depending on fuel system, injectors, and tuning. Dramatic mid-to-top end power increase.
  • Considerations: A turbo upgrade will require supporting mods: larger injectors (or port injection), upgraded fuel pump, high-flow fuel pressure regulator, and of course a custom tune. Without these, the engine will run dangerously lean. Additionally, the transmission and clutch must be upgraded to handle extra torque. Budget for a stronger clutch ($600–$1,200) and possibly a transmission rebuild ($2,000–$4,000) if targeting over 450 whp.

4. Full Exhaust Systems

A full exhaust system upgrade improves exhaust flow, reduces backpressure, and enhances turbo response. On the FA24 WRX, a common path is to replace the downpipe (often catted or catless), followed by the midpipe and catback. A turbo-back exhaust (downpipe + midpipe + catback) yields the largest gains.

  • Cost: $1,000 – $2,500 for a full turbo-back system (including downpipe, midpipe, axle-back or catback). Catless downpipes are cheaper ($300–$500) but may cause emissions testing issues. Catted downpipes ($500–$800) are legal in many states but slightly restrictive. Catback exhausts range from $600–$1,200.
  • Variations: Single exit vs. dual exit, 3-inch vs. 3.5-inch diameter, stainless steel vs. titanium. Weight savings can be 15–30 pounds.
  • Installation: DIY 2–4 hours; professional $250–$500. Removing the stock downpipe often requires patience with rusty bolts.
  • Benefits: 20–40 whp gain with a downpipe + tune. Improved exhaust tone (deeper, louder, more aggressive). Reduced turbo spool time.
  • Considerations: A catless downpipe will throw a CEL for catalyst efficiency unless tuned out. Many aftermarket downpipes include a bung for the oxygen sensor. Full exhausts can be very loud – consider baffled mufflers or a resonated midpipe for daily driving.

5. Engine Tuning

After making significant modifications, engine tuning is essential to optimize performance. The FA24 ECU can be tuned via Cobb Accessport or EcuTek platforms. A proper tune ensures fuel trims are safe, adds ignition timing, and adjusts boost targets to match the hardware.

  • Cost: $500 – $1,500. Cobb Accessport (handheld device) is $695. Custom etune from a reputable tuner is typically $350–$600 for a base map and revisions. Dyno tuning ranges from $500–$1,000+.
  • Variations: Off-the-shelf (OTS) maps are included with the Accessport but are generic and conservative. Custom tunes tailored to your specific modifications and fuel (pump gas, ethanol blend) are highly recommended for safety and performance.
  • Benefits: 10–50 whp depending on hardware. Smoother power delivery, improved fuel economy (if driven conservatively), and the ability to run different octane levels.
  • Considerations: Never run a tune designed for a different build. Data logging is critical – ensure your tuner provides support for revisions. Consider flex-fuel sensing (e.g., Cobb Flex Fuel kit, $650) to run up to E85 for additional power gains.

Additional Modifications

1. Suspension Upgrades

Enhancing the suspension improves handling, reduces body roll, and can make the extra power usable on twisty roads and track days. The FA24 WRX has a MacPherson strut front and double-wishbone rear, both of which benefit from upgraded springs, dampers, and sway bars.

  • Cost: $500 – $2,000 for coilovers or spring/shock combo. Sway bars add $200–$400 each; end links $50–$150.
  • Variations: Spring/strut packages (e.g., Bilstein B16, $1,800) vs. full coilovers (e.g., KW V3, $2,500). Adjustable sway bars allow fine-tuning of understeer/oversteer balance.
  • Installation: DIY 4–6 hours for coilovers; professional $400–$800. Alignment is required ($100–$150).
  • Benefits: Flatter cornering, improved steering feel, better weight transfer. Can lower ride height 1–2 inches for aesthetic and aerodynamic benefits.
  • Considerations: Lowering too much can compromise ride quality and cause rubbing. Retain good ground clearance for daily driving. Upgrading to lower control arms or adjustable links may be needed to correct alignment after lowering.

2. Brake System Enhancements

With increased power, the factory brakes may fade during heavy use. Upgrading pads, rotors, and fluid is the most cost-effective way to improve stopping power. For aggressive driving, a big brake kit (BBK) with multi-piston calipers is recommended.

  • Cost: $300 – $1,500. Performance pads (e.g., Hawk HPS, $90–$130 per axle). Slotted or drilled rotors ($300–$600 per set). Stainless steel brake lines ($120–$200). BBK from StopTech, AP Racing, or Brembo can cost $2,000–$5,000 for front and rear.
  • Installation: Pad/rotor replacement DIY 1–2 hours per axle; professional $150–$300. BBK installation requires more labor and potentially wheel spacer or wheel size changes.
  • Benefits: Reduced brake fade, shorter stopping distances, better pedal feel. Safety improvement is especially noticeable with tuned cars exceeding 400 hp.
  • Considerations: High-performance pads may produce more dust and noise. Ensure wheels clear the larger calipers – many OEM 18-inch wheels fit standard BBKs, but 17-inch wheels usually won’t.

Building a Performance Package: Stages and Budgeting

Many owners prefer to build in stages to spread out costs and enjoy incremental gains. Below is a suggested package progression with estimated total costs (parts only, not including labor).

Stage 1: Tune + Intake

Cost: $700–$1,200. Includes an Accessport (or equivalent) and a high-flow intake. Gains: 20–30 whp. Improves throttle response and sound. This is the best value per dollar and a great starting point.

Stage 2: Downpipe + Intercooler

Cost: $1,200–$2,500 (plus Stage 1). Includes a catted downpipe, upgraded intercooler (TMIC or FMIC), and a retune. Gains: 40–60 whp on pump gas. Significantly reduces heat soak and allows higher boost safely.

Stage 3: Full Exhaust + Turbo Upgrade

Cost: $3,000–$5,000 (plus previous stages). Includes a full turbo-back exhaust, larger turbo, and compatible injectors/fuel pump. Gains: 450–550 whp on E85. Requires upgraded clutch and likely stronger transmission mounts. This stage transforms the car into a serious street/track machine.

Labor Costs and DIY Savings

Installing parts yourself can save hundreds to thousands of dollars. Basic jobs like intake, catback exhaust, and coilovers are manageable for a competent DIYer with standard tools. More complex jobs like turbo swaps or intercooler piping require more experience. Average shop labor rates are $100–$150 per hour in most areas. Expect to pay 4–10 hours for a turbo swap, 2–4 hours for a downpipe, and 1–2 hours for an intake. Always factor in an alignment after suspension work and a dyno session for tuning.

  • Cobb Tuning – EcuTek and Accessport tuning solutions for the FA24 WRX.
  • Import Image Racing – A leading retailer of Subaru performance parts, offering competitive pricing on intake, exhaust, and turbo upgrades.
  • AWE Tuning – Known for high-quality exhaust systems and tuning packages for the WRX.
  • IWSTI Forums – A community-driven resource for real-world dyno results, install guides, and user experiences.

Conclusion

Investing in performance mods for the FA24 WRX can lead to remarkable improvements in power and handling, but a clear understanding of the cost breakdown is essential. Starting with a simple intake and tune offers the best bang for the buck, while a full build with turbo, fuel system, and exhaust can transform the car into a 500+ horsepower monster. Always budget for supporting modifications, professional tuning, and potential drivetrain upgrades to ensure reliability. Whether you’re a casual enthusiast or a track-day regular, planning your upgrades step by step will help you get the most out of your FA24 WRX without breaking the bank.