Whiteline WEK129 Front Essential Bushing Kit for 2011-2021 Subaru WRX/STI VA/GV

Vehicle Fitment

• 2015-2021 Subaru WRX (VA Platform, 2.0L FA20DIT Turbo H4, AWD)
• 2011-2021 Subaru WRX STI (GV/VA Platform, 2.5L EJ257 Turbo H4, AWD)

Fitment Notes

• Fits VA-chassis WRX (2015-2021) and GV/VA-chassis STI (2011-2021) only - does not fit the 2022+ WRX (VB platform).
• KCA425 component is rated for motorsport/competition use - note any applicable road-use regulations in your region.
• Front wheel alignment is required after installation.
• Suspension specialist installation is strongly recommended due to the 4-hour fitment complexity.

Features

• Three-component front suspension upgrade bundled into a single kit - anti-lift/caster, control arm, and steering rack bushings.
• KCA425 Anti-Lift/Caster kit adds positive static caster and corrects front geometry under braking and acceleration for sharper turn-in and better traction.
• W0508 front control arm lower inner front bushing reduces compliance and restores precise wheel tracking and steering feedback.
• KSR207 steering rack and pinion mount bushings eliminate steering rack movement for more direct, precise steering feel.
• All components use Whiteline synthetic elastomer - resistant to oil, grease, ozone, and weathering.
• Allows geometry tuning between anti-lift and anti-dive via recommended spacer combinations (KCA425).
• Significant reduction in understeer and improved cornering confidence on both street and track.
• Covered by Whiteline's Lifetime Warranty.

Specifications

• Position: Front Axle
• Bushing Material: Synthetic Elastomer (Polyurethane) / Low-Compliance Bearings (KCA425)
• Wheel Alignment Required: Yes - Front
• Estimated Installation Time: 4 Hours
• Difficulty: Suspension Specialist Recommended
• Package Weight: 2.356 kg (5.19 lbs)
• Warranty: Lifetime

Included Components

• W0508 - Front Control Arm Lower Inner Front Bushing Kit (2x Shell Bushings, multiple Bushings and Tubes)
• KCA425 - Front Control Arm Lower Inner Rear Anti-Lift/Caster Bushing Kit (Spacers, Removal Tool included)
• KSR207 - Front Steering Rack and Pinion Mount Bushing Kit
• 1x Installation Guide
• 1x Assembly Grease

Product Description

The Whiteline WEK129 is a front essential bushing kit purpose-built for the 2015-2021 Subaru WRX and 2011-2021 Subaru WRX STI (GV/VA platforms). It bundles three of Whiteline's most impactful front suspension upgrades into a single package: the KCA425 anti-lift/caster kit, W0508 front lower control arm inner bushings, and KSR207 steering rack mount bushings. Together, these components address the primary sources of front-end vagueness, understeer, and alignment instability in the VA/GV chassis.

The KCA425 anti-lift/caster kit is the centerpiece - replacing the front control arm's vertically mounted inner rear bushing with a low-compliance bearing unit that adds positive static caster and significantly reduces geometry change under braking and hard acceleration. The result is sharper initial turn-in, improved cornering traction, and more stable front-end behavior. The W0508 and KSR207 components restore precision to control arm movement and eliminate steering rack flex, rounding out a complete front bushing overhaul. Front alignment is mandatory after installation and specialist fitment is recommended.