Height adjustmentmaximum
Everyday use
Comfort
Handling
Track Performance
Audi RS4 B9 Coilovers: Greater Precision in Corners with Adequate Comfort
The Audi RS4 Avant B9 (model year 2017 and later) hides its 450 PS behind a modest exterior—until you take your first fast corner. By then, at the latest, it becomes clear that, thanks to the 2.9 TFSI V6 biturbo, there’s plenty of power under the hood. But this power demands a setup that’s up to the task: During spirited driving, the stock suspension reaches its limits. With KW coilover kits and our height-adjustable coil springs, you can now customize the performance, ride height, and cornering precision of your Audi RS4 Avant (B9) yourself. Also suitable for models with DRC that are looking for alternatives due to damper leaks.
A Direct Comparison of the Stock Suspension, RS Sport Suspension Plus (DRC), and KW Coilover Suspension for the Audi RS4 B9
The Big Suspension Comparison
The factory suspension
While the sporty, firm-tuned passive suspension gives the RS4 a high-riding stance, the RS Sport Suspension lowers the car by approximately 30 mm right from the factory. The cross-linked dampers in the RS Sport Suspension actively counteract pitch and roll movements. However, ride comfort suffers significantly in the DRC’s Dynamic mode, while in Comfort mode, bouncing is commonplace. This is further compounded by well-known wear and leakage issues starting at 20,000 km. If you’re looking for a cost-effective alternative or want a sporty, low-riding ride but still want plenty of comfort, KW suspensions is the perfect choice. Starting with the 2022 model year, even Audi is installing a manually adjustable coilover suspension (RS Sport Suspension Pro) in the Competition Plus package in collaboration with us.
KW V3
Top-notch technology from motorsports—adapted for the road: The KW V3 is our bestseller and features separately adjustable compression and rebound damping. With 16 clicks of rebound adjustment and 12 clicks of compression adjustment, you can fine-tune comfort and performance independently of one another. In addition, your Audi RS4 Avant (B9) is lowered continuously by 15 to 35 mm in the front and 20 to 40 mm in the rear. It’s up to you how much of the lowering range you utilize. You can adjust the settings at any time. For vehicles with DRC, the problem of leaking dampers is permanently solved by installing the V3 completely independently of the DRC system, seamlessly replacing it. The cancellation kit included in the package is used for this purpose. The KW V3 is available for the RS4 B9 with or without DRC.
Discover our products for the Audi RS4 B9
All Coilover Suspensions for the Audi RS4 B9
Is your Audi DRC leaking? When is switching to KW really worth it?
If your Audi DRC is leaking, you risk an expensive total loss: If several shock absorbers and accumulators are defective, the costs can quickly rise to 3,500 to 4,000 euros. That’s when many people decide to switch to a coilover suspension, because it’s more affordable and solves the problem once and for all. Even Audi now relies on KW technology instead of the DRC in its Competition Plus package.
Technology Highlights of Our Coilover Suspensions
All Technology Highlights
Customized lowering
This coilover suspension offers maximum possible lowering, customized to your vehicle model. You can also change this at any time after installation.
Adjustable rebound (low-speed)
You'll notice the difference with every click! Here, you can adjust the low-speed rebound with 16 clicks. This adjusts the ride characteristics, making them either harder or more comfortable.
Adjustable compression damping (low-speed)
You can fine-tune the low-speed compression damping even after installation. The vehicle's handling and stability will benefit from 12 clicks.
Composite spring disc
The height-adjustable KW spring plate is made from a resistant and friction-optimized polyamide composite material with a stainless steel insert. In contrast to anodized aluminum adjustable spring plates, the polyamide composite material prevents possible oxidation.
Additional technologies
Tested on the 7-Post
High-quality stainless steel housing
Trapezoidal thread
Technical component reportAnswers to questions about the Audi RS4 B9 coilover suspension, HAS, and DRC issues
Frequently Asked Questions
How can I tell if the DRC system on the Audi RS4 B9 is defective?
Typical signs include rattling noises coming from the suspension area, spongy or imprecise handling, and visible oil stains on the shock absorbers. The cause is usually a leak in the hydraulic DRC shock absorbers or a loss of pressure in the accumulators, which can occur after approximately 20,000 to 60,000 km.
Can I retrofit a KW coilover suspension to an RS4 B9 with DRC?
Yes, this is possible. For vehicles equipped with DRC, there are compatible KW V3 and KW V4 coilover kits that include a KW deactivation kit (ESC module), which cleanly deactivates the electronic damper control without triggering error messages in the cockpit.
How much can the Audi RS4 B9 be lowered with a coilover suspension?
With a KW V3 or V4 coilover suspension, you can lower the front axle by 15 to 35 mm and the rear axle by 20 to 40 mm, with each axle adjustable continuously within the tested adjustment range. With KW height-adjustable springs, your RS4 Avant will have a more subtle drop of 5 to 25 mm in the front and 5 to 30 mm in the rear.
Do I need TÜV approval for a KW coilover suspension on an RS4 B9?
Yes, a KW coilover suspension must be registered in the vehicle documents for your Audi RS4 B9. However, we make it as easy as possible for you and include a parts certificate with every coilover suspension. There you’ll find the reliable lowering ranges, and the registration process is straightforward.
Our community shows just how much lowering potential and precision are packed into the KW coilover suspension
Audi RS4 B9 with KW coilover suspension: Here's what the modification can look like
Our authorized dealer partner, BTM Turbo, demonstrates the installation of the KW V3 on the Audi RS4 B9 and shares its first driving impressions