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KYB 5510021 Suspension Strut - Front Right
| Brand | KYB 57056 |
|---|---|
| Clutch Included | Not Included |
| Compatible Refrigerant Oil Type | PAG 46 |
| Compressor Type | 209-210 |
| Mounting Hardware? | Not Included |
| Mounting Type | Case Mount |
| New or Reman | Remanufactured |
| O-Ring A Number/Desc | [24117] / Teflon O-Ring |
| Oil Filled | Included |
| Pulley Belt Type | Non-Clutch |
| Refrigerant Type | R134a |
| Suc Prt Typ Note | Left Hand Suction |
| Suction Port Type | Rotolock Fitting |
| Type | York |
| Product line | Gas-a-just |
| Fits | —3 vehicles |
OE monotube replacement. Restores original control with a gas-a-just strut design.
High-pressure monotube design. Separates gas and oil for fade-free operation and instant response.
Triple-chrome piston rod. Helps reduce seal wear for smoother, longer-lasting performance.
Cross-references Subaru 20310VA000 for the same application. See all 1.
KYB Gas-a-just Front Right Strut for WRX STI
The KYB Gas-a-just 5510021 is a monotube suspension strut built as an OE-style replacement for the front right position. It is engineered to restore the original control and handling characteristics of the Subaru WRX STI while delivering quick response from KYB’s high-pressure gas design.
Key Features
- Monotube OEM replacement strut for precise damping response
- High-pressure gas and oil separation for fade-resistant operation
- Triple chrome plated piston rod helps reduce seal wear and fluid leakage
- Fast gas pressure response improves steering feel and control
- Supports proper operation of vehicle safety systems that rely on suspension performance
- Includes B-stop and R-stop design elements
- Upper mount type: 12X1.25
Product Details
KYB Gas-a-just struts use two working chambers: an air-free hydraulic section for responsiveness and control, and a high-pressure nitrogen gas chamber with a floating piston for consistent ride quality and instant performance when conditions change. This design is well suited for drivers looking to restore factory handling on the Subaru WRX STI without changing the vehicle’s suspension geometry or intended behavior. Part number 5510021 is a direct-fit suspension strut for the front right side on 2015-2017 Subaru WRX STI models.
This part cross-references Subaru 20310VA000 for the same application.
What It Helps Address
- Excessive front-end bounce or oscillation
- Reduced steering response during acceleration, braking, or cornering
- Fluid leakage from a worn strut assembly
- Loss of damping control from age-related strut wear
- Noise or vibration related to degraded suspension performance
Installation Notes and Tips
Fits 2015-2017 Subaru WRX STI, front right. Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. KYB recommends new strut mounts, part number SM5664, to reduce noise and vibration. A KYB strut boot, part number SB123, can help protect the new strut from dirt, debris, and road salt.
Quality Assurance
KYB is known for OE suspension engineering, and the Gas-a-just line is designed as a monotube replacement to restore factory-style control on the Subaru WRX STI. Part number 5510021 is built to match the application requirements for consistent front right suspension performance.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2017 | Subaru | WRX STI | Front Right | Replace suspension strut and coil spring assembly according to manufacturer's instructions.; Gas-a-just |
| 2016 | Subaru | WRX STI | Front Right | Replace suspension strut and coil spring assembly according to manufacturer's instructions.; Gas-a-just |
| 2015 | Subaru | WRX STI | Front Right | Replace suspension strut and coil spring assembly according to manufacturer's instructions.; Gas-a-just |
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