Understanding the Exedy Stage 2 Flywheel

The Exedy Stage 2 Flywheel is engineered for enthusiasts who demand a significant upgrade in their vehicle’s drivetrain performance without sacrificing daily drivability. Unlike a standard one-piece cast iron flywheel, the Stage 2 uses a chromoly steel or billet steel construction, offering an ideal middle ground between a ultra-light racing flywheel and the heavy stock unit. This design reduces rotational inertia while maintaining the thermal capacity needed for repeated hard launches and track use.

The flywheel’s mass is carefully optimized—typically around 8 to 10 pounds lighter than OEM—which directly cuts the rotating mass at the crankshaft. This reduction allows the engine to rev more freely and drop RPMs faster during shifts, translating to quicker acceleration out of corners and improved throttle response. The Stage 2 flywheel is often paired with Exedy’s Stage 2 clutch kit, but it can also work with other aftermarket clutches rated for similar torque levels.

Compared to Stage 1 flywheels, which are usually only a mild weight reduction, the Stage 2 offers a more aggressive weight loss without going to the extreme of a Stage 3 carbon unit that can be noisy and difficult to drive in traffic. For many owners of turbocharged Subarus, Mitsubishi Evos, and rear‑wheel‑drive Japanese sports cars, the Exedy Stage 2 flywheel represents the sweet spot for street and track use.

Installation Costs: What to Expect

Installing a flywheel is not a trivial job—it requires removing the transmission, clutch assembly, and often the exhaust system or driveshaft. As a result, costs can vary widely based on the shop, your car model, and any additional parts needed. Below is a detailed breakdown.

Labor Costs

Most independent shops charge between $75 and $150 per hour for labor. A typical flywheel and clutch replacement on a front‑wheel‑drive or all‑wheel‑drive vehicle takes 4 to 6 hours. For a rear‑wheel‑drive car with a simpler drivetrain, it may take 3 to 5 hours. Expect labor charges to range from $300 to $900 depending on your region and shop rates. Dealerships can be $120–$200 per hour, pushing the job into the $600–$1,200 range.

Parts Costs (Including the Flywheel)

  • Exedy Stage 2 Flywheel: typically $250–$400 (retail).
  • Clutch kit (recommended): Exedy Stage 2 clutch kit is around $350–$500. Using a new clutch is essential because the old clutch disc may not seat correctly on a different flywheel step height.
  • Throw‑out bearing and pilot bearing: $30–$80, always replace during flywheel service.
  • Pressure plate bolts and flywheel bolts: often sold separately, $20–$50.
  • Transmission fluid and gaskets: $30–$100 if reusable gaskets are damaged.

Total parts costs for a proper installation range from $700 to $1,200 for the flywheel and all supporting components. If you are only installing the flywheel on an existing clutch that has enough life, you might save $300–$500, but it’s risky—most professionals recommend doing both together.

Hidden and Optional Costs

  • Exhaust modifications: Some cars require dropping the exhaust to access the bell housing; exhaust gaskets and studs can add $50–$200.
  • Alignment fees: If you remove the transmission mounts, a four‑wheel alignment may be needed later.
  • Flywheel resurfacing: Not needed with a new Exedy flywheel, but if you reuse an old flywheel, resurfacing costs about $50–$100.
  • Special tool purchases: If you DIY, a flywheel holding tool or transmission jack can add $100–$200.

Cost‑Saving Tips

If you are mechanically inclined, a DIY installation can save $400–$800 in labor. However, be prepared to work on a lift or with a high‑quality jack stands, and budget for any specialized tools. Many enthusiasts opt to have a reputable performance shop do the work because a misaligned flywheel or incorrect bolt torque can destroy the harmonic balancer or crank bearings.

For a realistic total price (parts + labor) at a good independent shop, budget $1,200 to $2,000. At a high‑end tuner shop, the job can exceed $2,500. Always ask for a written estimate that includes possible unforeseen expenses.

Power Gains and Performance Benefits

Installing the Exedy Stage 2 flywheel alone does not increase peak horsepower, but it dramatically improves how the engine delivers its power. The effect is best described as “freeing up” the engine’s ability to spin up and down. Here are the key performance benefits with realistic numbers.

Rotational Mass Reduction

A stock flywheel on a typical turbocharged four‑cylinder weighs 18–25 pounds. The Exedy Stage 2 flywheel is usually 8–10 pounds lighter. This reduction in moment of inertia has a multiplying effect in lower gears. For example, a 10‑pound flywheel weight reduction can feel like dropping 100–150 pounds of vehicle weight in first gear. The car accelerates more eagerly and reaches redline quicker.

Throttle Response and Engine Rev Matching

With less rotating mass, the engine revs faster when you blip the throttle. This is especially noticeable during heel‑and‑toe downshifts and quick gear changes. Turbo lag can feel reduced because the engine spools up more freely against a lighter flywheel. Many drivers report that the car “feels livelier” and more eager to build boost.

Real‑World Dyno and Quarter‑Mile Observations

  • Dyno testing: While peak whp may only rise 1–3 hp (due to reduced drivetrain loss), the area under the curve often improves because the engine spends less time overcoming rotational inertia between shifts.
  • Quarter‑mile times: A lighter flywheel can shave 0.1–0.3 seconds off your quarter‑mile time, though the biggest gains come from faster, smoother shifts.
  • Mid‑range acceleration: The engine pulls harder from 3,000–6,000 RPM because power is not being “wasted” spinning up a heavy mass.

It is important to note that the true power gain is in drivability, not peak numbers. The Exedy Stage 2 flywheel optimizes the power band, making your car feel stronger through the entire RPM range.

Downsides to Consider

  • Lightened flywheel noise: Some gearbox rattle at idle is normal, especially in neutral with the clutch engaged.
  • Stalling risk: The lighter mass requires more throttle input when starting from a stop—new drivers may stall more frequently.
  • Reduced engine braking: When you lift off the throttle, the revs drop faster, providing less engine braking. This changes your braking technique on the track.

Performance Review and Owner Feedback

Across forums and enthusiast groups, the Exedy Stage 2 flywheel receives consistently positive reviews, especially when paired with the matching Stage 2 clutch. Here is a summary of real‑world experiences.

Daily Driving Impressions

Most owners note that the car is completely streetable. The pedal pressure is slightly stiffer than stock but still comfortable for traffic. The most common comment is that the car “feels much more responsive” and “wakes up” the engine. One Subaru WRX owner reported that the flywheel transformed the car’s character from a sluggish daily driver into a fun back‑road machine.

Track and Autocross Performance

On the track, the faster rev‑up and rev‑matching capability allows drivers to keep the engine in the power band more easily. The quicker RPM drop between shifts helps with rev‑matched downshifts, giving the driver more confidence under hard braking. However, some competitive autocrossers prefer a slightly heavier flywheel for smoother clutch engagement in tight corners. The Stage 2 strikes a good balance for most track days.

Common Issues and Solutions

  • Noise: Lightweight flywheels can produce a metallic rattle at idle from gear lash. This is normal and does not indicate a problem. Using a thicker synthetic transmission fluid (like Motul Gear 300) can reduce noise.
  • Clutch chatter: If you do not replace the clutch disc, the OEM disc may not mate well with the new flywheel’s friction surface. Always use a new Exedy disc.
  • Hard starts on hills: Some drivers find hill starts more challenging. A short practice period alleviates this.

Compatibility and Fitment

The Exedy Stage 2 flywheel is available for a wide range of vehicles, including but not limited to:

  • Subaru WRX / STI (2002–2021)
  • Mitsubishi Lancer Evolution (VIII–X)
  • Mazda MX‑5 Miata (NA–ND)
  • Nissan 240SX (S13/S14)
  • Toyota Supra (A80) and other JDM platforms
  • Honda Civic Si / Accord V6

Always verify that the flywheel part number matches your engine’s crankshaft bolt pattern and step height. The Exedy website provides fitment guides. Visit Exedy’s official site for a comprehensive part lookup.

Maintenance and Longevity

A properly installed Exedy Stage 2 flywheel should last the lifetime of the clutch disc (often 30,000–60,000 miles depending on driving style). The chromoly steel resists warping better than cast iron. However, the friction surface may show wear patterns over time. If you ever replace the clutch again, have the flywheel resurfaced by a specialist who can maintain the correct step height. Do not machine it like a standard cast iron unit—that can ruin the heat treatment.

Signs that your flywheel needs attention include:

  • Vibration during clutch engagement (warped surface).
  • Grinding noises (glazed friction surface).
  • Difficulty shifting (incorrect step height after resurfacing).

Is the Exedy Stage 2 Flywheel Right for You?

Before buying, ask yourself:

  • Do you track your car or drive aggressively on back roads? If yes, the Stage 2 flywheel will bring noticeable benefits.
  • Is your car a dedicated daily driver? The stiffer clutch and reduced engine braking may annoy some commuters. Consider a Stage 1 flywheel for lighter weight reduction with easier driving.
  • Are you upgrading your turbo or engine internals? The Stage 2 flywheel pairs well with tuned engines making up to 400–500 lb‑ft of torque. For higher levels, step up to a Stage 3 or twin‑disc setup.

For most enthusiasts who want a balance of performance and civility, the Exedy Stage 2 flywheel is an excellent investment. Read a detailed review on Import Tuner for additional perspective.

Conclusion

The Exedy Stage 2 flywheel is a proven upgrade that delivers tangible improvements in throttle response, acceleration, and overall driving engagement. While the installation costs add up—typically $1,200–$2,500 at a shop—the gains in performance and feel make it a worthwhile modification for any enthusiast willing to invest. Do your research, budget accordingly, and pair it with a quality clutch kit for best results. For more details on specific applications, check the Exedy product catalog or consult your local performance shop.