Why the Eibach Pro-Kit Is a Top Choice for Your Subaru BRZ

The Subaru BRZ is renowned for its balanced chassis and rear‑wheel‑drive dynamics, but many owners seek a more aggressive stance and sharper cornering response. The Eibach Pro‑Kit spring set is one of the most popular suspension upgrades for this platform. Designed specifically for the BRZ (and its twin, the Toyota GR86), these springs lower the vehicle by approximately 1.0–1.2 inches front and rear, reducing the center of gravity without compromising daily‑drive comfort. This article provides an in‑depth look at the benefits of the Eibach Pro‑Kit and offers detailed, step‑by‑step installation guidance to help you achieve a professional result in your own garage.

Comprehensive Benefits of Eibach Pro‑Kit Springs

The Eibach Pro‑Kit is engineered to improve both form and function. Below we break down the key advantages, supported by technical details that matter to BRZ enthusiasts.

Lowered Center of Gravity and Improved Handling

By lowering the BRZ’s ride height approximately 1.0 inch at the front and 1.2 inches at the rear, the Pro‑Kit significantly reduces body roll during cornering. This drop lowers the vehicle’s center of gravity, which enhances transient response in slaloms and tight turns. Eibach uses a progressive spring rate design—softer initial compression for comfort, then increasing stiffness to control body roll under load. The result is flatter cornering and more confident steering feel, especially when combined with upgraded dampers. Many owners report a noticeable reduction in understeer, allowing the BRZ’s rear end to rotate more predictably on throttle.

Enhanced Aesthetics Without Sacrificing Clearance

The Pro‑Kit delivers a purposeful, “filled‑arches” stance that eliminates the factory wheel gap. The drop is substantial enough to look aggressive but avoids the extreme low that leads to scraping on speed bumps or driveway approaches. Eibach designs the spring ends to seat correctly in the factory rubber isolators, preserving a compliant ride. The subtle rake (slightly lower rear) helps maintain proper weight transfer under acceleration and braking.

Ride Quality That Remains Daily‑Friendly

One of the Eibach Pro‑Kit’s greatest strengths is its ability to lower the car without ruining ride quality. The progressive spring rates absorb small bumps and expansion joints with minimal harshness, while larger impacts are controlled without bottoming out. This makes the BRZ more livable on rough roads compared to many coilover systems that require stiff damping. Paired with the factory struts, the Pro‑Kit offers a ride that is firmer than stock but still comfortable for daily commuting.

Optimized Spring Rates for Performance Driving

Eibach engineers selected spring rates (approximately 174 lb/in front, 168 lb/in rear for the BRZ) that work harmoniously with the vehicle’s weight distribution and suspension geometry. These rates reduce squat during hard acceleration and dive under braking, keeping the chassis more stable. The increased roll stiffness also allows drivers to carry more speed through corners. For autocross or track day enthusiasts, the Pro‑Kit provides an excellent foundation that can be further improved with adjustable sway bars or camber plates.

For official specifications and vehicle fitment details, visit the Eibach Pro‑Kit product page for Subaru BRZ.

Essential Tools and Preparation for Installation

Installing lowering springs on a BRZ is a straightforward job for a competent DIYer, but it requires careful preparation and the correct tools. Rushing the process can lead to damaged components or improper spring seating. Below is the complete list of tools and steps to set up your workspace.

Tools You Will Need

  • Floor jack and two heavy‑duty jack stands
  • Metric socket set (10mm, 12mm, 14mm, 17mm, 19mm, 21mm)
  • Combination wrenches (10mm–19mm)
  • Spring compressors (manual or hydraulic; ensure they are rated for coil springs)
  • Torque wrench capable of 0–150 ft‑lbs
  • Breaker bar (18‑inch or longer) for stubborn bolts
  • Prying tool (trim removal tool or flathead screwdriver) for plastic clips
  • Penetrating oil (e.g., WD‑40 or PB Blaster) for rusty fasteners
  • Paint marker or masking tape to mark alignment positions
  • Gloves and safety glasses

Workspace and Safety Preparation

Park the BRZ on a level, solid surface. Disconnect the negative battery terminal to prevent any accidental electrical shorts, especially if you will be near ABS sensors or airbag wiring. Loosen the lug nuts on all four wheels before jacking the car. Then, using the jack, lift the front of the car and place jack stands under the factory pinch‑welds (reinforced jack points). Never work under a vehicle supported only by a floor jack. Repeat for the rear.

Remove all four wheels and set them aside. For extra safety, you can slide the wheels under the car’s frame rails as an additional precaution. Clean the suspension components with a rag or brake cleaner to make bolt removal easier and prevent dirt from entering the strut mounts.

Step‑by‑Step Spring Removal and Installation

The following instructions cover the front and rear suspension. The process is similar for each corner, but note that the rear setup differs slightly due to the separate spring and shock arrangement. Work on one corner at a time to avoid mixing up parts.

Front Strut Assembly Removal

Start with the front. Locate the three 14mm nuts on top of the strut tower under the hood. Loosen them slightly but do not remove yet. Next, remove the 17mm lower strut‑to‑knuckle bolts (two bolts on each side). You may need to use a breaker bar. If the bolts are tight, apply penetrating oil and wait a few minutes. Once the lower bolts are removed, the strut will be free to drop down. Now remove the three top nuts and pull the entire strut out from the wheel well. Be careful not to damage the brake line or ABS wire—zip‑tie them out of the way if necessary.

Compressing and Removing the Factory Springs

Place the strut assembly in a spring compressor fixture. Compress the factory spring evenly by alternating between the two compressor arms. Compress until the spring is loose enough to rotate the upper mount freely. Remove the center nut (19mm) that holds the top mount bearing. Carefully separate the mount, dust boot, and bump stop. Lift the compressed spring off. Inspect the top mount bearing for wear—if it feels gritty, consider replacing it with a new OEM unit. Also check the bump stops; if they are torn, order new ones.

Installing the Eibach Pro‑Kit Springs

Place the new Eibach spring onto the spring compressor, ensuring the end of the spring aligns with the lower spring perch. Install the upper mount, dust boot, and bump stop (use the factory bump stop or a shorter aftermarket version if you want more droop travel). Thread on the top nut but do not fully tighten yet. Slowly decompress the spring compressor, making sure the spring seats correctly in both the top and bottom perches. Torque the top nut to 45 ft‑lbs (check your specific vehicle specifications).

Reinstall the strut assembly into the vehicle. Start with the top three nuts, only snug them. Then lift the lower part of the strut into the knuckle and insert the two lower bolts. Torque the lower bolts to 80 ft‑lbs. Finally, torque the top nuts to 22 ft‑lbs (or as specified in your service manual). Repeat for the other front corner.

Rear Spring Replacement Procedure

The rear suspension uses a separate spring and shock absorber. To remove the rear spring, you must disconnect the lower end of the shock absorber (12mm bolt) and then use a spring compressor to compress the spring. The spring sits in a lower control arm bucket and an upper rubber isolator. After compressing, carefully slide the spring out. Install the Eibach spring, ensuring the pigtail end seats properly in the lower bucket. Decompress and verify that the spring is fully seated. Reconnect the lower shock bolt, and torque to 45 ft‑lbs. Do the same for the other rear corner.

For detailed torque values and step‑by‑step photos, refer to a trusted resource like the FT86 Club installation guide for lowering springs.

Final Assembly and Torque Check

After all four springs are installed, reinstall the wheels. Hand‑tighten the lug nuts, then lower the car to the ground. Torque the lug nuts to 85 ft‑lbs in a star pattern. Reconnect the battery. At this point, the suspension will be at full droop; do not drive the car before performing a proper alignment.

Post‑Installation Considerations and Alignment

Lowering the BRZ changes its suspension geometry. The camber, caster, and toe settings will shift—especially camber, which becomes more negative. While some negative camber improves cornering, excessive toe misalignment will cause rapid tire wear and poor straight‑line stability. It is essential to get a professional four‑wheel alignment immediately after installation.

  • Front Camber: −1.5° to −2.0°
  • Front Caster: 5.0° to 6.0°
  • Front Toe: 0 to 1/16 inch total toe‑in
  • Rear Camber: −1.0° to −1.5°
  • Rear Toe: 1/16 to 1/8 inch total toe‑in

These settings provide a good balance between straight‑line stability and cornering grip. Many alignment shops can adjust the front camber using the factory eccentric bolts; the rear may require aftermarket camber arms if you want to dial in more negative camber. For a reference, see the Subaru BRZ factory alignment specifications.

Break‑In Period

Eibach springs do not require a formal break‑in, but the suspension will settle over the first 200–500 miles. During this time, avoid aggressive driving or full suspension compression. After 500 miles, re‑check the spring seats and torque on the strut top nuts. If you notice any unusual noises (clunks, creaks), inspect the spring alignment and isolators.

Maintenance and Long‑Term Care

Lowered springs can accelerate wear on factory struts, especially if you drive on rough roads. Eibach recommends replacing the dampers with performance shocks such as the Eibach Pro‑Damper kit or Koni Yellow struts to maximize performance and longevity. Inspect the springs annually for corrosion or damage, particularly in winter climates where road salt is used.

Comparing the Pro‑Kit to Other Lowering Options

The Eibach Pro‑Kit sits between mild drop springs (like the Eibach Sportline, which drops 1.5–2 inches) and full coilover systems. For drivers who want a modest drop with improved handling and minimal compromise in ride quality, the Pro‑Kit is the ideal choice. Coilovers offer adjustable ride height and damping, but they are more expensive and often stiffer. If you intend to track the car frequently, a coilover setup may be worth the investment. However, for a street‑focused BRZ that sees occasional autocross or spirited canyon driving, the Pro‑Kit provides the best bang for the buck.

Conclusion

Installing Eibach Pro‑Kit springs on your Subaru BRZ is a rewarding upgrade that enhances both appearance and driving dynamics. The lower center of gravity improves cornering stability, the progressive spring rates preserve ride comfort, and the aggressive stance turns heads. With careful preparation, the right tools, and attention to torque specifications and alignment, you can complete the installation in a weekend. The result is a BRZ that feels more connected to the road and more eager through every bend. For further reading on suspension setup, visit the Eibach technical support page or consult your vehicle’s service manual.