Why Upgrade the VB WRX Suspension?

The Subaru WRX (VB generation) already delivers sharp handling and all-weather grip, but its factory suspension is tuned for a balance of comfort, cost, and everyday drivability. For enthusiasts who want to reduce body roll, improve turn-in response, or lower the center of gravity, aftermarket suspension upgrades are the most direct path to a more engaging driving experience. A well-chosen suspension package transforms the car from a competent daily driver into a precise, confidence-inspiring machine whether carving canyon roads or tackling an autocross course.

Key benefits of upgrading include:

  • Reduced understeer and more neutral cornering balance
  • Shorter braking distances and less nose dive under hard stops
  • More consistent tire contact with the road surface
  • Ability to fine-tune ride height for aesthetics or track clearance

Before diving into specific components, it helps to understand how the stock suspension works and where its limitations show up during aggressive driving.

Understanding the VB WRX Suspension Architecture

The VB WRX uses a MacPherson strut front suspension and a double-wishbone rear setup. The front strut towers are relatively tall, and the chassis exhibits some flex during hard cornering — especially when pushing near the limit. The rear suspension offers good camber control but can benefit from stiffer bushings to reduce deflection. The factory dampers are valved for comfort, meaning they allow more body motion than performance-oriented coilovers or dampers.

Upgrading the suspension involves addressing two main areas: reducing chassis flex (structure) and controlling wheel motion (damping, springs, and geometry). Each component discussed below targets one or both of these goals.

Strut Bars: Reducing Chassis Flex for Sharper Turn-In

Strut bars — also called strut tower braces — connect the top of the front (and sometimes rear) strut towers with a rigid bar. Under lateral load, the chassis can twist, causing the strut towers to move relative to each other. This flex delays turn-in and reduces steering precision. Installing a strut bar essentially ties the towers together, keeping the suspension geometry more consistent during cornering.

Front strut bars are the most common upgrade for the VB WRX. They are relatively inexpensive and easy to install. Look for a bar that clears the engine bay components — some designs use a hinged or two-piece construction for easier installation. Popular options include those from Cusco and Perrin.

Rear strut bars (also called trunk-mounted braces) are less common but still beneficial, especially for sedans. They reduce flex in the rear chassis, improving the car’s ability to put power down while exiting corners and reducing unpredictable oversteer.

Installation tips for strut bars:

  • Ensure the bar does not contact any moving engine parts or hood liner.
  • Tighten bolts to factory torque specifications — overtightening can damage the strut tower mounts.
  • Consider pairing a front strut bar with a front lower chassis brace for even more rigidity.

Coilovers: The Ultimate Handling Upgrade

Coilovers replace the factory strut-and-spring assembly with a single, adjustable unit. They allow independent adjustment of ride height, spring preload, and damping (both compression and rebound on higher-end models). For the VB WRX, coilovers offer the most comprehensive improvement in handling because they address both spring rate and damping characteristics.

Choosing the Right Coilover for Your Needs

Coilovers range from entry-level height-adjustable kits to full-race setups with remote reservoirs. Consider these factors when selecting:

  • Ride comfort vs. track performance: Entry-level coilovers like the BC Racing BR Series offer 30-level damping adjustability and a comfortable street ride with occasional track use. For more aggressive setups, KW or Ohlins provide better high-speed damping control.
  • Spring rates: Stock VB WRX spring rates are around 5-6 kg/mm front and rear. Aftermarket options range from 6-8 kg/mm for street use to 10+ kg/mm for track-only builds. Heavier springs reduce body movement but can make daily driving harsh.
  • Adjustability features: Look for kits with independent ride height adjustment (spring preload separate from height) and adjustable camber plates. Camber plates allow you to increase negative camber for better cornering grip.
  • Material and warranty: Stainless steel or anodized bodies resist corrosion. A manufacturer warranty (typically 1-2 years) protects against defects.

Installation Considerations for Coilovers

  • You will need to remove the strut assembly, transfer the top mount (or use new camber plates), and reinstall.
  • After installation, get a professional alignment. Adjusting ride height changes camber, caster, and toe settings.
  • Allow the springs to settle for 500–1000 miles before doing a final corner balance or alignment check.
  • Use antiseize on adjustment collars to prevent corrosion and ease future adjustments.

Sway Bars: Controlling Body Roll and Understeer

Also known as anti-roll bars, sway bars connect the left and right suspension via a torsion bar. They resist the car’s tendency to lean (roll) during cornering. The VB WRX comes with relatively soft sway bars from the factory, leading to noticeable body roll and understeer. Upgrading to thicker bars greatly improves stability.

When choosing sway bars:

  • Front sway bar: A larger front bar (typically 22-24mm vs stock 20mm) reduces understeer but can increase the car’s tendency to push wide. Pair with a stiffer rear bar for neutral behavior.
  • Rear sway bar: This is the most effective single upgrade for reducing understeer on the VB WRX. A 20-22mm rear bar with adjustable end links allows fine-tuning.
  • End links: Upgraded adjustable end links (from companies like Whiteline or Kartboy) eliminate plastic-on-plastic play and allow preload adjustment of the sway bar.
  • Bushings: Replace factory rubber sway bar bushings with polyurethane or spherical bearings for reduced deflection.

Whiteline offers a comprehensive sway bar kit specifically for the VB WRX, including the matching end links and bushings.

Control Arms and Bushings: Geometry and Responsiveness

Upgrading control arms and bushings goes hand-in-hand with coilovers and sway bars. The factory rubber bushings allow significant deflection, which dulls steering response and causes dynamic camber and toe changes under load.

Front Lower Control Arms

Aftermarket front lower control arms (e.g., from Cusco or SuperPro) often feature polyurethane or spherical bushings. They also may provide increased caster for better straight-line stability and more steering feel. Some designs allow for additional negative camber beyond factory adjustments.

Upgraded rear arms with adjustable bushings let you dial in toe and camber after lowering. This is critical because lowering the VB WRX beyond about 1.5 inches can cause the rear wheels to toe-out, making the car unstable under hard acceleration. Adjustable rear arms restore proper alignment and improve traction.

Bushing Replacements

Press-in polyurethane bushings are available for the rear subframe, differential mount, and front lower control arms. These reduce drivetrain slop and wheel hop. However, they transmit more noise and vibration into the cabin — a trade-off worth considering for a daily driver.

Alignment and Tuning After Suspension Mods

Any significant suspension change — especially coilover installation or ride height adjustment — requires a professional alignment. The VB WRX’s factory alignment specs are conservative, with minimal negative camber and some toe-in for stability. For better cornering, aim for:

  • Front camber: -1.5° to -2.5° (more negative improves cornering grip but wears inner tire edges on the street)
  • Rear camber: -1.0° to -1.5° (match front for balanced handling)
  • Toe: Zero toe front and rear (or slight toe-out front for sharper turn-in, but reduces straight-line stability)
  • Caster: As much as possible (factory allows some adjustment via subframe slots; aftermarket arms can add more)

If you’ve installed coilovers with camber plates, use those to set camber at the front. Rear camber adjustment may require aftermarket camber arms. A reputable alignment shop with experience in performance cars can dial these settings and note whether any additional parts are needed to reach your targets.

Budgeting and Prioritizing Your Suspension Build

Suspension upgrades vary widely in cost. Building a complete setup can range from a few hundred dollars for basic bars and bushings to several thousand for a premium coilover system. Here’s a rough prioritization guide:

  1. Rear sway bar + end links: The single most effective handling upgrade for the VB WRX. Reduces understeer significantly. Cost: ~$250–$400.
  2. Front strut bar: Increases steering precision. Cost: ~$100–$200.
  3. Coilovers: The biggest single upgrade for overall handling, ride height adjustment, and damping control. Cost: ~$900–$2,500.
  4. Control arms and adjustable bushings: Necessary to get the most from coilovers, especially if lowering beyond 1.5 inches. Cost: ~$400–$800 for a set.
  5. Alignment and corner balance: Around $150–$300, depending on shop rates and whether you corner-weight the car.

Installation Tips for a DIY Enthusiast

While some suspension work is straightforward, certain jobs require experience and proper tools. If you plan to install components yourself, keep these points in mind:

  • Safety first: Use jack stands and wheel chocks. Never work under a car supported only by a floor jack.
  • Torque wrenches: Use accurate torque wrenches for critical fasteners — especially suspension pivot bolts and strut top nuts. Overtightening can damage mounts or snap bolts.
  • Penetrating oil: Spray bolts and nuts (especially sway bar bracket bolts) a day before to ease removal.
  • Mark original settings: Before disassembling, measure ride height at each corner and note alignment settings if available. This helps with reassembly and initial setup of coilovers.
  • Check clearances: After installing any lowered springs or coilovers, turn the steering full lock each way and check that tires do not rub on fenders, control arms, or sway bars.
  • Re-torque after settling: After driving 500–1000 miles, re-torque all suspension bolts (especially control arm pivot bolts and sway bar end links) as components settle and bushings break in.

Common Mistakes to Avoid

Here are pitfalls that even experienced builders sometimes make:

  • Over-tightening end links: Adjustable end links should be tightened when the suspension is under load (car on the ground) to avoid preloading the sway bar.
  • Skipping the alignment: Even a minor ride height change affects toe and camber. Driving with incorrect toe will wear tires quickly and can make the car unpredictable.
  • Ignoring corner balancing: For track-focused cars, corner balancing (adjusting ride height at each corner to balance weight distribution) improves handling consistency. It’s not necessary for street-only use but is highly recommended for competitive driving.
  • Using mismatched parts: Mixing spring rates from different brands without understanding the implications can lead to poor ride quality or unpredictable handling. Stick with matched kits or well-known combinations.
  • Neglecting maintenance: Adjustable suspension components need periodic cleaning and lubrication (coilover threads, spherical bearings, polyurethane bushings). Salt and moisture can seize adjustment collars.

Conclusion: Building a Better Handling VB WRX

Upgrading the VB WRX’s suspension is one of the most rewarding modifications you can make. The car’s architecture responds well to strut bars, coilovers, sway bars, and revised bushings. Each component addresses a specific weakness: chassis flex, body roll, damping control, or geometry retention. By carefully selecting parts that match your driving goals — whether daily comfort, weekend autocross, or track days — you can transform the WRX into a car that feels more connected, stable, and responsive.

Start with a rear sway bar and end links for an immediate reduction in understeer. Then consider a front strut bar to sharpen steering. If you want the ultimate in adjustability, invest in a quality coilover kit with camber plates. Finally, dial in the alignment and consider control arms or bushings to unlock the chassis’s full potential. With the right setup, your VB WRX will reward you with a driving experience that rivals far more expensive performance cars.

For further reading and community feedback, check out the VB WRX forums on Subispeed and IWSTI for detailed build threads and product reviews.