Riaction GT1 Coilovers for the 2017+ Audi S4 (B9) are a premium suspension upgrade designed for drivers who want the perfect balance of ride comfort, performance, and style. Built with high-quality materials and precision engineering, these coilovers deliver reliable handling and long-term durability while allowing you to achieve the aggressive lowered stance you’re after.
Each GT1 kit features a mono-tube shock design with a 52mm electroplated carbon steel body for consistent damping and strength. With 32 levels of damping adjustment, you can fine-tune your suspension setup for daily driving, spirited street performance, or weekend track use. The CNC-machined aluminum pistons, cold-wound performance springs, and polyurethane seals ensure smooth operation, precise handling, and reduced maintenance over time.
Engineered to be fully rebuildable and backed by a 2-year warranty, Riaction GT1 Coilovers offer the adjustability and performance expected from a high-end aftermarket suspension system—making them a smart investment for enthusiasts looking to improve handling, achieve the right stance, and enhance overall driving dynamics.
Features
- Full Length Ride Height Adjustment
- 32 Damping Adjustment Levels
- Mono-Tube Linear Damper Design
- Seamless 52mm Electroplated Carbon Steel Shock Body
- O.D. 20mm Piston Rod For MacPherson Suspension
- O.D. 14mm Piston Rod For Non-MacPherson Suspension
- Unique 44mm High-Flow CNC 6061 Aluminum Piston
- Unique Thinned CNC 6061 Aluminum Floating Piston
- Polyurethane Oil Seal
- SAE9254 Cold-Wound Spring
- Multi-Thickness Valving Shims
- Unique Low-Gas Pressure Design
- 7.5w Compounded Suspension Fluid
- Fully Rebuildable
Specifications
| Part Number |
AD-009-SS |
| Part Name |
Riaction GT1 Coilovers |
| Vehicle |
2017+ Audi S4 |
| Chassis Code |
B9 |
| Adjustment Type |
1-Way |
| Damping Adjustable |
Yes |
| Height Adjustable |
Yes |
| Spring Rates - Front |
10K |
| Spring Rates - Rear |
8K |
| Front Spring Length (Default) |
8 inches |
| Rear Spring Length (Default) |
Not Applicable |
| Swift Springs Optional |
No |
| Camber Plates - Front |
No |
| Camber Plates - Rear |
No |
| Note 1 |
EDC equipped models will display an error code |
| Note 2 |
EDC Code Delete Kit may be needed |
Vehicle Fitment
- 2017 Audi S4 (B9)
- 2018 Audi S4 (B9)
- 2019 Audi S4 (B9)
- 2020 Audi S4 (B9)
- 2021 Audi S4 (B9)
- 2022 Audi S4 (B9)
- 2023 Audi S4 (B9)
