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The SuperPro DURO4425K front lower inner control arm bushing kit brings DuroBall hybrid technology to 2015-2021 Subaru WRX and WRX STI. Instead of traditional polyurethane, DURO4425K uses a metal-shell spherical bearing combined with SuperPro's polymer liner, providing the compliance needed for daily driving while eliminating the deflection common in worn rubber bushings. This standard-alignment design drops directly into OEM control arms with no geometry changes required.
Fitment
DURO4425K fits the following vehicles:
- 2015-2021 Subaru WRX
- 2015-2021 Subaru WRX STI
- 2015 Subaru WRX STI Launch Edition
- 2016 Subaru WRX STI Series.HyperBlue
Product Specifications
| Specification | Detail |
|---|---|
| Part Number | DURO4425K |
| Position | Front Lower Control Arm, Inner |
| Technology | DuroBall Metal-Poly Hybrid |
| Alignment Change | Standard (no geometry change) |
| Material | Steel shell, SuperPro polymer liner |
| Hardware | Included |
| Prop 65 | Yes |
| UPC | 9317745771678 |
Key Features
- DuroBall technology combines spherical metal bearing with polymer liner for precise suspension control
- Eliminates front-end vagueness caused by worn OEM rubber inner control arm bushings
- Standard alignment design preserves factory caster and camber settings
- More compliant than solid spherical bearings, reducing NVH transfer to the cabin
- Direct press-in fit for OEM WRX/WRX STI front lower control arm
- Designed and tested by SuperPro for VA-chassis Subaru applications
Installation Notes
Installing DURO4425K requires pressing out the OEM bushings from the lower control arm and pressing the DuroBall units in. A hydraulic press and appropriate mandrel set are required. Ensure arm is clean and free of burrs before pressing. Torque all suspension hardware with the vehicle at ride height. A front alignment check is recommended after installation although geometry does not change with the standard-alignment design.
Frequently Asked Questions
- What makes DuroBall different from standard polyurethane? DURO4425K uses a metal spherical shell with a SuperPro polymer liner, which allows more rotational freedom than solid poly while still providing far less deflection than worn rubber. The result is sharper turn-in and more predictable cornering response.
- Will DURO4425K change my alignment settings? No. DURO4425K is the standard-alignment version and replaces the OEM bushing without shifting camber or caster. You should still verify alignment after any suspension work.
- Is this compatible with lowered WRX/STI builds? Yes. DURO4425K is designed for the VA-chassis 2015-2021 WRX and STI and works at lowered ride heights within normal range.
- Does the Magnuson-Moss Warranty Act apply to suspension bushing upgrades? Yes. Under the Magnuson-Moss Warranty Act, your vehicle manufacturer cannot void your chassis or suspension warranty solely because you installed aftermarket bushings such as DURO4425K, as long as the installation was performed correctly.
- Is a professional alignment required after installing DURO4425K? A front alignment check is recommended after any control arm bushing replacement to confirm all settings are within spec, even though DURO4425K does not alter geometry by design.
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