Product Details
BC Racing DS Series Coilovers for the 2017+ Audi S4 (B9) blend street-tuned ride quality with track-ready adjustability, giving you more body control than any OEM damper without the harshness of a pure race kit. Every kit is extensively tested on the B9 chassis and refined until it balances ride quality with performance — the reason S4 coilovers from BC Racing are the best-selling adjustable kits in their segment worldwide.
DS Series kits pair a mono-tube damper with BC's proprietary digressive piston design — increased low-speed damping for flat corner entry, compliant high-speed response over expansion joints and potholes. The finished shock body is silver, visually distinct from the BR Series, and ride height is adjustable independent of spring preload. BC Racing takes pride in choosing spring rates and damper valving that balance comfort and performance — you never end up with the oversprung, harsh-riding kit some brands ship as their only option. Drivers who want to deviate from the factory setup can order Swift Springs, custom spring rates, and custom valving at checkout; BC will re-valve the dampers to match whatever you specify, a level of customization most brands reserve for their top-tier race kits.
BC Racing has been manufacturing adjustable coilovers since 2004 and is one of the most popular coilover brands in the automotive tuning industry for a reason: competitive pricing, deep customization, proven reliability, and a fully rebuildable damper design that lasts years instead of seasons. These S4 coilovers arrive tuned for the B9 chassis and ready to bolt in — no break-in period, no guessing at setup. Every kit ships with a 2-year manufacturer warranty, lifetime access to BC service parts (pistons, seals, shafts — no unit replacement required when it's time for a rebuild), and in-house tech support from both BC Racing and the Springrates team.
Features
- 30-level simultaneous compression/rebound damping adjuster
- Mono-tube damper with BC's proprietary digressive piston
- Silver satin-chrome finished shock body (visually distinct from the BR Series)
- Ride height adjustable independent of spring preload
- Upper mount hardware varies by chassis — camber plates, pillowball, or reused OEM mounts. See the Specifications table for what's included on your kit.
- Swift Spring and custom spring rate upgrades available at checkout
- Custom damper valving paired with custom spring rates on request
- Fully rebuildable — replacement parts available from BC for the life of the shock
- 2-year manufacturer warranty against defects
Specifications
| Part Number | S-27-DS |
| Part Name | DS Series Coilovers |
| Vehicle | 2017+ Audi S4 FWD/AWD (B9) 53mm Front Strut |
| Drivetrain | FWD/AWD |
| Chassis Code | B9 |
| Damping Adjustment | 1-Way (30 levels) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 10 kg/mm |
| Spring Rate - Rear | 8 kg/mm |
| Spring Size - Front | 62-220-10K |
| Spring Size - Rear | 62-190-8K |
| Swift Springs - Front | 62-203-X |
| Swift Springs - Rear | 62-178-X |
| Camber Plates - Front | Not Applicable |
| Camber Plates - Rear | Not Applicable |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear | Divorced |
| Notes | Designed for 53mm front strut diameter — measure yours before ordering. |
Vehicle Fitment
- 2017 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2018 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2019 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2020 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2021 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2022 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2023 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2024 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2025 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2026 Audi S4 FWD/AWD (B9) 53mm Front Strut