Upgrading your Subaru WRX with a coilover suspension is one of the most transformative modifications you can make, sharpening handling, reducing body roll, and lowering the center of gravity for a more planted feel on both street and track. This detailed guide walks through every step of the installation process, from preparing your workspace to fine-tuning dampening and ride height. We also include brand insights and external resources to help you choose the right coilover system and achieve professional-grade results.

Why Install Coilovers on Your WRX

Factory suspension on the WRX is tuned for a balance of comfort and capability, but enthusiasts often crave more aggressive cornering ability, faster steering response, and a lower stance. Coilovers replace the entire strut-and-spring assembly with a single, adjustable unit. This allows independent control of ride height, spring preload, and dampening (rebound and compression). Benefits include reduced understeer, improved traction during hard launches, and customizable ride quality. However, proper installation and setup are critical to avoid premature wear and poor handling.

Tools and Materials

Before you begin, gather everything you need. Working with a complete set of tools avoids interruptions and keeps you safe.

  • Coilover kit – ensure it matches your WRX model year (e.g., 2008-2014 GR/GV, 2015+ VA, or 2022+ VB)
  • Floor jack and four jack stands – rated for at least the vehicle’s weight
  • Socket set – metric sockets from 10mm to 22mm
  • Wrench set – combination wrenches, plus an 18mm for sway bar end links
  • Spring compressor – mandatory if reusing top hats (though most coilovers come pre-assembled)
  • Torque wrench – 1/2-inch drive, capable of 100 ft-lbs
  • Penetrating oil – like PB Blaster or Kroil
  • Breaker bar – for stubborn bolts
  • Angle grinder or reciprocating saw – occasionally needed for seized hardware
  • Safety glasses and mechanic gloves
  • Pry bar or pickle fork – for separating ball joints if necessary
  • Alignment tools – a camber gauge and toe plates (if doing a home alignment after installation)

Safety Preparation

Working under a vehicle carries inherent risks. Always chock the wheels that remain on the ground. Use jack stands at the manufacturer-recommended lift points: the front subframe and rear differential housing for the WRX. Never rely solely on a hydraulic jack. Wear safety glasses when using penetrating oil or grinding. Gloves protect against sharp edges and chemicals. Work in a well-ventilated area if using spray solvents. If you are not familiar with suspension work, consider having a professional assist or at least verify your final torque values.

Step 1: Lifting and Supporting the Vehicle

Place the jack under the front center jack point and lift until both front wheels are off the ground. Position jack stands under the front subframe pinch welds. Repeat for the rear: lift from the differential housing and place stands under the rear subframe or reinforced pinch welds. Ensure the car is level and stable. Shake the vehicle gently to confirm it won’t tip.

Step 2: Removing the Wheels and Cleaning Access

Loosen the lug nuts while the wheels are still on the ground, then lift and remove them. Use penetrating oil on suspension bolts now, especially the lower strut bolts and sway bar end link nuts. Allow the oil to soak for five to ten minutes while you prepare your tools.

Step 3: Disconnecting the OEM Suspension (Front)

Upper strut mount: Working inside the engine bay, locate the three 12mm nuts securing the top of the strut to the strut tower. Remove them with a socket and extension.

Lower strut bolt: At the knuckle, remove the 17mm bolt and nut that pass through the fork. If the bolt is seized, apply more penetrating oil and use a breaker bar. Do not force it – use a hammer or an impact driver with caution.

Sway bar end link: Remove the 14mm nut on the end link stud. The end link will separate from the strut.

Brake line bracket: Unclip the brake line bracket from the strut body to avoid stretching the line.

Remove the assembly: With all fasteners removed, the strut can be pulled out from the bottom. Tilt it to clear the control arm and pull downward. If the lower control arm is in the way, you may compress the arm slightly with a pry bar.

Step 4: Disconnecting the OEM Suspension (Rear)

The rear setup is similar but requires accessing the top mount from inside the trunk. For sedans, remove the trunk liner panels; for hatchbacks, fold down the seats and remove the interior trim. The top mount uses either two or three 12mm nuts depending on model. Remove them. Then at the knuckle, remove the lower 17mm bolt. Detach the sway bar end link. The rear spring may be separate from the strut; if your car has a separate spring, you will need a spring compressor to disassemble the strut assembly. However, most WRX owners installing coilovers simply remove the entire OEM strut/spring unit as one piece. Once free, remove it from the vehicle.

Step 5: Preparing the Coilovers

Before installation, set all coilovers to a baseline configuration. Most kits come with preset dampening and height settings. It is wise to measure the length of the coilover body (from the lower mounting bracket to the top of the spring perch) and record the initial value. Adjust the ride height perches to obtain a moderate drop – about 1 to 1.5 inches lower than stock – to start. Set dampening to the manufacturer’s recommended street setting (often halfway between full soft and full hard). If your coilovers have separate rebound and compression adjustments, refer to the manual.

Note: Some coilovers, such as those from BC Racing, come with pre-installed top hats and bump stops. Others, like certain KW Suspensions models, use OEM top hats – if so, you’ll need to reuse the original ones (see tips below).

Reusing OEM Top Hats (if required)

If your coilovers do not come with top hats, you must transfer the original mounts. Compress the OEM spring with a spring compressor until there is no load on the mount. Remove the center 17mm nut, then remove the top hat and spring. Install the top hat onto the new coilover, ensuring the orientation of the mounting holes matches the strut tower. Use the supplied hardware and tighten to the coilover manufacturer’s torque spec.

Step 6: Installing the Front Coilovers

Insert the new coilover from the bottom, aligning the top studs into the strut tower holes. Guide the top mount into place. Install the three top nuts and tighten them hand-tight. Then, install the lower bolt through the knuckle fork and the coilover. Do not torque anything to final spec yet – the suspension needs to be under load (car on the ground) before final torquing to avoid preloading bushings. However, you can snug the top nuts to 30 ft-lbs and the lower bolt to 100 ft-lbs temporarily.

Reattach the brake line bracket and sway bar end link. The end link’s ball joint should be tightened to 30-40 ft-lbs.

Step 7: Installing the Rear Coilovers

Similar process: insert the coilover into the rear wheel well, align the top studs with the holes in the strut tower (accessible from inside the trunk or interior panel). Install the nuts loosely. Connect the lower bolt to the knuckle. Attach the sway bar end link. Ensure the coilover is seated fully – some rear installations require you to compress the suspension arm slightly to align the lower hole. Use a floor jack under the control arm to raise it gently if needed. Do not force anything.

Replace any interior trim and ensure the top hardware is secure.

Step 8: Ride Height Adjustment Strategy

After both sides are installed, reinstall the wheels and lower the car onto the ground (or onto four jack stands placed under the control arms to simulate ride height). It is essential to “settle” the suspension before measuring and adjusting ride height. Bounce the car at each corner several times, then roll the car forward and backward a few feet (if possible). This ensures the bushings and springs have taken their natural position.

Measure the distance from the center of the wheel to the fender edge. Most WRX owners aim for a 1.5 to 2 inch drop in front and a slightly smaller drop in the rear to maintain rake (nose-down attitude). Adjust the spring perches on the coilover body accordingly – turning the perch collar clockwise (from the top) lowers the car, counterclockwise raises it. A Cusco or similar spanner wrench helps turn the locking rings. After adjustment, retighten the locking rings.

Step 9: Preload Setting (If Applicable)

On a true coilover (where the spring sits on an adjustable perch separate from the height adjustment), spring preload affects ride quality and corner balance. Standard advice: for street driving, set preload so that the spring is just snug when the suspension is at full droop (wheels off the ground). Over-preloading makes the ride harsh; under-preloading can cause clunking. Most direct-replacement coilovers for WRX have preload and ride height combined, so just follow the manufacturer’s initial setting.

Step 10: Dampening Adjustment

Dampening (or damping) controls how quickly the suspension returns after compression. Soft settings (fewer clicks from full stiff) improve ride comfort, while stiffer settings reduce body roll. Start with the factory recommendation. After a test drive, adjust by two clicks at a time. For example, Tein coilovers typically have 16-24 clicks of adjustment. Rebound and compression knobs are often separate on higher-end units. A good baseline: set rebound to 10 clicks from full stiff and compression to 8 clicks from full stiff. Log your settings and adjust based on feel and cross-weight measurements if you track the car.

Step 11: Final Torquing

With the car on the ground (all four wheels touching, suspension loaded), torque all fasteners to specifications:

  • Top strut nuts: 20-30 ft-lbs (check your coilover manual)
  • Lower strut-to-knuckle bolt: 100-110 ft-lbs
  • Sway bar end link nuts: 30-40 ft-lbs
  • Wheel lug nuts: 85-95 ft-lbs (for stock wheels; verify for aftermarket)

Step 12: Alignment and Corner Balance

After any suspension change, a professional alignment is required. WRX alignment specs vary – typical street settings: -1.5° front camber, -1.0° rear camber, 0° front toe, 0.10° rear toe-in. Coilovers with adjustable camber plates (like many BC Racing models) allow fine-tuning. If you have access to scales, corner-balancing the car adjusts the ride heights per corner to equalize weight distribution – crucial for track use. Expect to pay $80-$150 for a basic alignment; corner balancing adds $200-$400.

Common Mistakes and Troubleshooting

  • Not preloading suspension before torquing: This twists the bushing, causing premature wear and a harsh ride.
  • Over-tightening top nuts: Can strip threads or crack the top hat.
  • Low ride height without adjusting sway bar: You may need shorter end links to prevent binding at extreme drops (over 2 inches).
  • Clunking noises: Usually from loose sway bar links, insufficient preload, or a misaligned top mount. Check all bolts.
  • Rust-seized bolts: Apply penetrating oil 24 hours in advance for older cars. Heat from a torch can help, but avoid damaging surrounding components.

Choosing the right brand depends on your budget, intended use, and desired adjustability. Below are five highly regarded options:

BC Racing

BC Racing offers the BR and ER series, both popular in the Subaru community. The BR series features 30-level dampening adjustment and adjustable ride height via spring preload. Prices start around $1,000 for a full set. Many owners praise the comfort range and durability for daily-driven WRXs. Available with Swift springs upgrade.

KW Suspensions

KW’s Variant 1 through Variant 3 are premium options with stainless steel bodies, long-lasting seals, and refined dampening. The V3 offers separate rebound and low-speed compression adjustment. Expect to pay $1,800-$2,500. Known for excellent ride quality and track performance. They use a proprietary corrosion-resistant coating ideal for winter climates.

Tein

Tein manufactures the Street Basis, Street Flex, and MonoSport variants. The Street Flex is a favorite – it has a 16-click dampening adjuster, a durable powder-coat finish, and comes with ride height adjustability. Tein’s EDFC (electronic dampening control) can be added for in-cabin adjustment. Pricing from $700 (Basis) to $1,300 (Flex). Great value for enthusiasts on a budget.

Fortune Auto

Fortune Auto specializes in custom-valved coilovers. Their 500 and 510 series use high-quality components, and they offer optional Swift springs for improved longevity. Buyers can specify spring rates and dampening curves for their driving style. Prices around $1,400-$2,000. The company also offers rebuild and re-valve services in the United States, appealing to serious track users.

Bilstein

Bilstein’s B16 PSS10 coilovers are a high-end option featuring 10-position dampening adjustment, monotube gas shock technology, and long-lasting nickel-plated bodies. They are tuned specifically for each car model and maintain excellent damping performance even during sustained hard driving. Expect to spend $2,000 or more. Popular with those who want a no-compromise street/track system.

Post-Installation Break-In and Inspection

After installation, drive gently for about 50 miles to let the coilovers settle. Then recheck ride height and torque on all bolts. Listen for any rattles or creaks. Re-torque the top mount nuts after a week – they sometimes loosen slightly as the rubber bushings compress. Inspect for leaks around the damper shaft; minor oil film is normal, but dripping indicates a seal failure that should be addressed under warranty.

Performance Gains and Driving Impressions

Once properly installed, a good coilover setup transforms the WRX. Body roll in corners is drastically reduced. Steering becomes more immediate, and the car tracks better through sweeping curves. On rough pavement, the suspension may feel firmer, but quality coilovers like KW or Fortune Auto remain compliant. Braking distances improve slightly as the setup reduces nose dive. On wet or loose surfaces, the car feels more confident with improved weight transfer. Over time, the suspension will mellow slightly – consider a follow-up re-check at 1,000 miles.

Conclusion

Installing a coilover suspension on your WRX is a rewarding weekend project that yields immediate handling improvements and a more aggressive look. By following this step-by-step guide, using proper tools, and selecting a reputable brand like BC Racing, KW, Tein, Fortune Auto, or Bilstein, you ensure a safe installation and optimal performance. Remember to torque bolts under load, get a professional alignment, and take time to fine-tune dampening and height for your driving needs. Enjoy the sharper cornering and the smile that comes with a well-sorted suspension.