Upgrading the clutch in your WRX is a significant step, especially when you're pushing the limits of power between 350 and 450 horsepower. The stock clutch simply isn't designed to handle that level of torque without slipping, overheating, or failing prematurely. Two popular options for this upgrade are Centric and Clutch Masters clutches. Both brands offer specific product lines that cater to the unique demands of a modified Subaru boxer engine. This article expands on what you need to know before making this upgrade, covering clutch types, installation details, break-in procedures, and real-world driving considerations to help you choose the right setup.

Understanding Clutch Options for 350–450 HP WRX

At this power level, the stock clutch is a weak link. The factory unit, designed for around 220–280 lb-ft of torque at the wheels, will slip under hard acceleration or boost. Upgrading to a performance clutch provides higher clamping force, better heat management, and materials that withstand higher friction. Both Centric and Clutch Masters offer clutches that fit the WRX (2002–2021 GD/GE/GH/GR/GV chassis) and are rated for this power range, but they come with different characteristics in terms of pedal feel, engagement, and longevity.

Centric Clutches – Features and Product Line

Centric is a well-known aftermarket manufacturer with a strong reputation for reliability in street and mild track applications. For the WRX, they typically offer a full-face organic or ceramic-metallic disc paired with a high-clamping pressure plate. Key advantages include:

  • Smooth engagement: Organic discs provide a progressive feel, making stop-and-go traffic manageable.
  • Heat resistance: Centric’s pressure plates are designed to reduce hot spots and prevent fade during repeated launches.
  • Direct fitment: Most Centric clutches are direct replacements, requiring no modifications to the flywheel or transmission.

For 350–450 hp, a Centric Stage 1 or Stage 2 organic clutch (torque rating around 330–400 lb-ft) is a solid choice for a daily driver. Higher stages use a ceramic-metallic disc rated for 450–500 lb-ft, but pedal effort increases noticeably. Centric also offers a lightweight flywheel option, which reduces rotational mass for quicker revs but can introduce gear noise and chatter on deceleration.

Clutch Masters Clutches – Options for the WRX

Clutch Masters (also known as CM) specializes in high-performance clutches and offers a broader range of disc types: organic, iron-fiber, and feramic/metallic. For the 350–450 hp range, the Clutch Masters FX series is the most relevant. The FX100 (organic disc, 330 lb-ft rating) is suitable for mild street use, while the FX200 (iron-fiber, 400 lb-ft) and FX300 (feramic, 500 lb-ft) are better for higher power and occasional track days. Notable features include:

  • Multi-disc options: For those pushing toward 450 hp, a twin-disc FX350 or FX400 provides massive clamping force with lighter pedal feel than a single aggressive puck disc.
  • Lightweight flywheels: Clutch Masters sells matched flywheels that reduce rotational inertia, improving throttle response at the cost of some drivability smoothness.
  • Modular design: Many CM kits include a new pressure plate, disc, pilot bearing, and alignment tool, simplifying installation.

Clutch Masters clutches tend to have a more aggressive engagement than Centric units, making them better suited for drivers who prioritize shift speed and torque capacity over daily comfort.

Single vs Multi-Disc Clutches

For 350–450 hp, a single-disc clutch with an organic or iron-fiber disc is generally sufficient for street driving. Single discs are simpler, cheaper, and easier to modulate in traffic. However, if your WRX sees frequent drag launches, autocross, or you plan to push beyond 400 hp, a multi-disc (twin or triple) clutch offers several advantages:

  • Higher torque capacity without a heavy pressure plate, reducing pedal effort.
  • Less rotating mass, improving rev-match downshifts.
  • Improved heat dissipation due to larger surface area.

Downsides include higher cost, increased chatter (especially when idling in neutral), and a need for more precise clutch modulation. For a dual-purpose car that sees track days, a twin-disc from Clutch Masters (FX400 or FX500) is a strong option. Centric does not offer multi-disc kits for the WRX, so if you need that, Clutch Masters is the clear choice.

Flywheel Considerations

When upgrading your clutch, you should also consider the flywheel. The OEM dual-mass flywheel (DMF) is heavy and designed to dampen vibrations, but it cannot be resurfaced for use with a performance clutch. Replacing it with a single-mass flywheel (SMF) is required for proper fitment. Options include:

  • Billet steel – heavier than aluminum but more durable, retains some rotational inertia for smoother takeoff.
  • Chrome-moly or billet aluminum – lighter, improves throttle response but can cause gear rattle at idle and more aggressive engagement feel.
  • Lightweight (10–13 lbs) – recommended for track-oriented cars; combined with a clutch rated for 450 hp, it makes rev-matching effortless but requires more clutch slip from a stop.

Both Centric and Clutch Masters offer flywheels matched to their clutch kits. If you choose a different manufacturer, ensure the flywheel step height (distance from flywheel face to friction surface) matches the clutch specifications to avoid geometry issues.

Installation Considerations

Installing a performance clutch on a WRX is a drivetrain-out job. The transmission must be dropped – a task that requires a lift or serious jacking skills. Key steps and pitfalls:

  • Flywheel bolts: Use new OEM stretch bolts or ARP hardware. Torque to spec (often 60–70 ft-lbs with Loctite).
  • Pilot bearing: Replace the pilot bushing or bearing in the crankshaft with a quality unit (NTN or Koyo). A failing pilot bearing causes gear grind and noise.
  • Throwout bearing: Install a new OEM or heavy-duty bearing. Some performance clutches include a concentric slave cylinder (CSC) delete kit – worth considering on later models (2008+ WRX) to avoid the known CSC failure.
  • Clutch alignment: Use the plastic alignment tool included with your kit. Misalignment will prevent the input shaft from sliding in and can damage the disc.
  • Clutch fork and pivot: Inspect the clutch fork, pivot ball, and return spring for wear. A bent fork or worn ball will cause inconsistent engagement. For high-power builds, consider a billet clutch fork and reinforced pivot.

Professional installation is strongly recommended unless you have experience with Subaru transmissions. Expect labor costs between 800 and 1200 USD at a reputable shop. If you install yourself, budget a full weekend and have a transmission jack.

Break-In Procedure

Performance clutches require a proper break-in period to achieve optimal performance and longevity. The procedure differs by manufacturer but generally follows these guidelines:

  • First 200–300 miles: Avoid full-throttle launches, sustained high-speed driving, and hard upshifts. Stick to city and highway driving with smooth starts.
  • Heat cycling: Perform 5–10 normal launches, then let the clutch cool for 30–60 minutes. This helps the friction material bond to the pressure plate and flywheel.
  • No clutch dumps: Even after break-in, avoid dumping the clutch at high RPM. This can glaze the friction surface and reduce clamping force.
  • Monitor for slip: During break-in, you may experience minor slippage if the pedal isn't fully disengaging – this is normal as the disc beds in. If slip persists after 500 miles, check adjustment and bleed the hydraulic system.

Centric and Clutch Masters have specific break-in recommendations printed in their instructions. Follow them exactly. A rushed break-in can cut clutch life by half or more.

Daily Drivability vs Track Performance

One of the biggest trade-offs with a performance clutch is pedal effort and engagement feel. For a WRX that serves as a daily driver and occasional weekend toy, you want a clutch that remains livable in traffic. Here's a comparison:

  • Organic discs (both brands) – smooth engagement, moderate pedal weight (20–30% stiffer than stock), acceptable for daily driving.
  • Iron-fiber (Clutch Masters FX200) – slightly sharper engagement, more chatter, pedal weight about 30–40% stiffer. Manageable but less forgiving.
  • Feramic/ceramic (Clutch Masters FX300 or Centric Stage 3) – aggressive engagement, pronounced chatter, pedal very stiff. Best for track-only cars.
  • Twin-disc (Clutch Masters FX400) – surprisingly light pedal (similar to organic single), but with very rapid engagement. Chatter is present but can be minimized with a heavier flywheel.

If you drive your WRX in stop-and-go traffic daily, stick with an organic single-disc from either brand. If you're willing to tolerate more noise and stiffer pedal for better performance, the FX200 or FX300 are excellent. For a dual-duty car, the twin-disc FX400 offers the best of both worlds but at a premium price.

Common Pitfalls to Avoid

Many WRX owners upgrade the clutch without considering supporting modifications, leading to premature failure or poor drivability. Avoid these mistakes:

  • Ignoring the clutch master cylinder and slave cylinder: A high-clamping pressure plate requires more hydraulic pressure. If your master cylinder is tired, the pedal may not fully disengage. Replace with a heavy-duty unit if you're using a stage 3 or greater clutch.
  • Using an old flywheel without resurfacing: An uneven flywheel face will cause the clutch to chatter and slip. Always resurface or replace. For DMF, replacement is mandatory.
  • Not upgrading the clutch fork pivot: The stock plastic pivot ball can crack under high clamping force. Swap to a brass or steel ball for reliability.
  • Neglecting the transmission fluid: A high-torque clutch can put extra stress on synchros. Use a quality 75W-90 GL-4 fluid (e.g., Motul Gear 300) to protect the gearbox.
  • Assuming all 350–450 hp clutches are the same: Torque ratings are often given at the flywheel, not the wheels. 350 whp on a WRX is roughly 400–420 lb-ft at the crank. Choose a clutch rated at least 10–15% above your expected wheel torque.

For a deeper technical explanation of Subaru clutch systems, this resource provides useful diagrams and failure analysis.

Cost Analysis and Value

Budget is a practical concern. Here are typical price ranges (2025 estimates, USD) for complete kits including pressure plate, disc, pilot bearing, and alignment tool (flywheel sold separately unless noted):

  • Centric Stage 1/2 organic clutch: $250–$350. Excellent value for street cars. Expect 40,000–60,000 miles of mixed driving.
  • Centric Stage 3 ceramic: $350–$450. Good for occasional track use but short life if abused.
  • Clutch Masters FX100 organic: $300–$400. Comparable to Centric in price and quality.
  • Clutch Masters FX200 iron-fiber: $400–$500. Best balance for 350–400 hp daily/track.
  • Clutch Masters FX300 feramic: $450–$550. More aggressive, shorter disc life.
  • Clutch Masters FX400 twin-disc: $800–$1,000. Includes flywheel. Premium option for high power and street comfort.
  • Flywheel (steel or aluminum): $200–$400 for aftermarket; OEM DMF replacement is about $350.
  • Installation labor: $800–$1,200.

For most WRXs at 350–400 hp, a Centric Stage 2 or Clutch Masters FX200 combined with a steel single-mass flywheel provides the best value. If you plan to add more power later, the FX300 or FX400 future-proofs the drivetrain.

Final Recommendations

Choosing between Centric and Clutch Masters depends on your driving profile and budget. For a primarily street-driven WRX that sees occasional aggressive pulls, a Centric Stage 2 organic clutch paired with a billet steel flywheel offers reliable performance, smooth engagement, and a reasonable price. For enthusiasts who attend track days or drag events and want a clutch that can handle repeated abuse without overheating, the Clutch Masters FX200 or FX300 iron-fiber disc provides better heat capacity and a more direct feel. If you have the budget and want a dual-purpose setup that retains near-stock pedal effort, the Clutch Masters FX400 twin-disc is the top-tier choice.

Regardless of the brand, invest in high-quality supporting components: a new throwout bearing, pilot bearing, and clutch fork pivot. Proper installation and break-in are non-negotiable. With the right setup, your WRX will deliver the power reliably and with a satisfying pedal feel that matches your driving style.