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The BMW F90 M5 is more than a high-performance sports sedan; it is a benchmark in the segment, blending brutal twin-turbo V8 power with everyday luxury. Its standard adaptive suspension is impressive, but serious drivers know that unlocking the chassis's full potential requires targeted upgrades. Whether you seek sharper turn-in, reduced body roll, a more aggressive stance, or better compliance over rough roads, the aftermarket offers proven solutions. This guide explores the best suspension upgrades for the F90 M5, focusing on three top-tier options: KW coilovers, H&R springs and sway bars, and active roll bar systems. We'll cover what each system does, how to choose, and what to expect from installation and setup.
Why Upgrade the Suspension on Your F90 M5?
The factory suspension is a compromise. BMW had to balance comfort, compliance, and cost across a global market. While the standard adaptive dampers are capable, they can leave experienced drivers wanting more. Upgrading delivers several measurable benefits:
- Reduced Body Roll – Stiffer springs, thicker sway bars, or active roll control keep the chassis flatter through corners, improving confidence and lap times.
- Improved Steering Feel – Lowering the center of gravity and reducing unsprung weight (with coilovers) sharpens steering response and front-end grip.
- Adjustable Ride Height and Damping – Coilovers allow you to set the ride height and damping to suit your driving style, track conditions, or personal preference.
- Better Aesthetics – A modest drop (1–1.5 inches) fills the wheel arches and gives the M5 a purposeful, planted stance without sacrificing daily usability.
- Enhanced Durability – Many aftermarket components use stainless steel, stronger bushings, and improved seals, outlasting factory parts on track-driven cars.
KW Suspension Upgrades: The Gold Standard for Coilovers
KW automotive is synonymous with precision-engineered suspension. Their coilover kits are designed and manufactured in Germany, with a focus on track-level performance that remains street-friendly. For the F90 M5, the KW Variant 3 (KW V3) is the most popular choice, but the brand also offers the more track-oriented KW Clubsport and the ultra-adjustable KW Variant 4.
KW Variant 3: A Closer Look
The KW V3 is a monotube coilover system featuring independent compression and rebound adjustment. This is a key differentiator from many competitors that offer only combined damping or rebound-only adjustment. Independent adjustment allows you to fine-tune low-speed ride comfort separately from high-speed chassis control.
- Independent Compression & Rebound – 16 clicks of rebound and 12 clicks of compression damping give a wide range from compliant daily driving to firm track settings.
- Stainless Steel Construction – All exposed parts are stainless steel, preventing corrosion and ensuring longevity even in harsh climates.
- Lowering Range – 20–50 mm (approx. 0.8–2.0 inches), enough for a significant drop while maintaining adequate ground clearance for most roads.
- TÜV Approved – The system carries TÜV approval, meaning it meets German quality and safety standards.
KW Clubsport Coilovers for the Track Enthusiast
For those who prioritize lap times, the KW Clubsport (also called KW Competition) uses a 2-way adjustable damping system with a more aggressive valving setup. It includes adjustable camber plates and a higher spring rate, making it ideal for heavy track use but still driveable to the circuit. Note that the ride is firmer than the V3, so comfort-oriented drivers should stick with the V3.
Installation Essentials for KW Systems
Proper installation is critical. We strongly recommend using a shop experienced with BMW chassis and coilovers. Post-installation, a full four-wheel alignment is mandatory. Key considerations:
- Pre-load the springs correctly to avoid clunking noises.
- Set ride height evenly on all four corners—measure from the center of the wheel to the fender lip.
- When adjusting damping, start from the softest setting and increase in 2-click increments until you find the sweet spot for your roads or track.
- If you track the car, consider upgrading the front sway bar end links to adjustable units for fine-tuning.
For more details, visit the official KW product page for the F90 M5 (KW Suspensions – F90 M5).
H&R Suspension Upgrades: Proven Performance Springs and Sway Bars
H&R Special Springs is another German powerhouse. Their products are known for precise manufacturing and a broad product range that includes lowering springs, sway bars, and coilover systems. For F90 M5 owners who want a cost-effective upgrade without the full complexity of coilovers, H&R springs and sway bars are an excellent choice.
H&R Sport Springs
The H&R Sport Springs lower the M5 approximately 1.0–1.5 inches (25–38 mm), giving a dramatic visual improvement while upgrading handling. They are designed to work with the factory adaptive dampers, making them a direct replacement.
- Progressive Spring Rates – The initial compressions are soft for comfort over small bumps, but as the spring compresses further, the rate increases to control body roll during aggressive cornering.
- German TÜV Certification – All H&R springs are TÜV-tested, ensuring safety and quality.
- Maintains Adaptive Damper Function – Because the springs are matched to the damper travel, the factory EDC (Electronic Damper Control) system continues to work without error codes, though some users report a slight increase in stiffness in Comfort mode.
Downside: The progressive spring design can feel slightly less controlled than a coilover linear spring on very smooth tracks, but for daily and weekend canyon driving, they are superb.
H&R Sway Bars (Anti-Roll Bars)
Even with the best springs, body roll is controlled by the sway bars. The F90 M5 has decent factory bars, but H&R offers tubular, adjustable thickness bars that significantly stiffen the chassis in roll without affecting ride harshness much.
- Adjustable Stiffness – Front and rear bars come with two or three adjustment points (soft, medium, stiff). This allows you to dial in understeer or oversteer tendency.
- Reduced Weight – Tubular construction is lighter than solid bars, reducing unsprung mass slightly.
- Minimal Installation Hassle – Sway bars can be installed without removing the subframe on the F90, typically a 2–3 hour job for a pro shop.
The combination of H&R Sport Springs and H&R sway bars is a proven setup for improving handling while retaining daily comfort. For compatibility details, see H&R Anti-Roll Bars – Official Site.
Active Roll Bar Enhancements: The Next Level of Chassis Control
Active anti-roll bars (also called dynamic sway bars or electronic roll control) are the most advanced suspension upgrade for the F90 M5. While the factory M5 offers a Dynamic Stability Control (DSC) system that brakes individual wheels to manage body roll, it cannot physically eliminate roll. Aftermarket active roll bars use motors or hydraulic actuators to connect and disconnect the sway bar link, or to apply variable torsional force.
How Active Roll Bars Work
In a passive system, the sway bar is always working. This creates a trade-off between roll resistance and single-wheel bump compliance. An active system can decouple the bar when driving straight over bumps (improving comfort) and stiffen it instantly in corners. This gives you the best of both worlds: a comfortable daily ride and flat cornering when you press the accelerator.
Benefits of Retrofitting Active Roll Bars on the F90 M5
- Instantaneous Roll Response – The system reacts in milliseconds, keeping the car level even during high-speed lane changes.
- Improved Tire Contact – By reducing weight transfer, all four tires maintain more even contact with the road, increasing grip and reducing tire wear.
- Customizable Firmness Profiles – Many active systems connect to the OBDII port or use a standalone controller, allowing you to adjust roll stiffness from full comfort to full track mode on the fly.
- Maintains Good Ride Comfort – Unlike ultra-stiff passive sway bars, active bars can go slack over rough pavement, preventing the harshness that comes with traditional sway bar upgrades.
Top Active Bar Systems for the F90 M5
Two leading systems are the KW Active Roll Bar (ARB) and the DSC Sport Controller combined with aftermarket sway bars. The KW system is a complete bolt-on kit that replaces the factory sway bars with motor-driven active anti-roll bars. The DSC Sport controller works by modifying the factory dynamic stability control signals to allow more active roll control, often used with stiffer custom sway bars.
Installation is significantly more complex than passive springs or coilovers. It involves wiring, control modules, and sometimes a dedicated hydraulic pump. Professional installation is mandatory.
For a deep dive into active roll technology, check out Turner Motorsport's guide to F90 M5 suspension.
Comparing KW, H&R, and Active Roll Upgrades
| Feature | KW Coilovers | H&R Springs + Sway Bars | Active Roll Bars |
|---|---|---|---|
| Cost (parts only) | $$$$ | $$ | $$$$$ |
| Installation Difficulty | High | Moderate | Very High |
| Ride Quality Change | Firm, adjustable | Slight increase in firmness | Can be OEM+ compliant |
| Body Roll Reduction | Significant | Moderate to significant | Extreme |
| Adjustability | Height & damping | Height (springs) + sway bar stiffness | Roll stiffness on the fly |
| Best For | Track days & stance | Daily/weekend fun | Ultimate all-rounder |
Installation and Tuning Considerations
Regardless of the upgrade path you choose, a few universal truths apply to the F90 M5:
- Alignment is Everything – After any suspension change, get a professional alignment. For the F90, stock specs are a starting point. Many performance shops recommend a slight increase in front negative camber (-1.5° to -2.0°) for better turn-in without excessive tire wear.
- Don't Forget the Subframe – The F90's front subframe mounting bolts should be torqued to spec after lowering to prevent any movement or noise.
- Check Your Damper Settings – If you keep the factory adaptive dampers (with H&R springs), ensure the system recalibrates after the spring swap. Some scan tools can reset the adaptation values.
- Use Quality Tools & Hardware – When installing coilovers, use new fasteners and don't reuse the old strut mount bolts. Always torque to factory specifications.
- Break-In Period – New springs and dampers need about 500 miles to settle. After that, re-check the ride height and alignment.
Final Thoughts: Choosing the Right Upgrade for Your F90 M5
The best suspension upgrade for your F90 M5 depends on your primary use. If you track your car frequently and want maximum adjustability, KW Variant 3 or Clubsport coilovers are unmatched. If you want a cost-effective way to lower and tighten up the car for spirited back-road driving, H&R springs paired with their sway bars strike a near-perfect balance. For those who want the absolute latest in chassis technology and can justify the budget and installation complexity, an active roll bar system transforms the car into a supercar-level handler while retaining everyday comfort.
Whichever path you choose, invest in professional installation and setup. A poorly set-up suspension not only underperforms but can also be unsafe. The F90 M5 is an extraordinary machine, and with these upgrades, it can become even sharper, more engaging, and more rewarding to drive. For more technical details and real-world owner reviews, refer to resources like BimmerPost F90 M5 Forum and the official product pages of KW Suspensions and H&R Springs.