Whiteline Trailing Arm Kit

2011–2025 Subaru Impreza WRX / STI Rear Adjustable Toe/Camber Kit

Part #: KTA123

Overview

The Whiteline Trailing Arm Kit KTA123 is a comprehensive suspension upgrade designed specifically for Subaru Impreza WRX and STI models from 2011 to 2025. This kit includes four high-quality, adjustable control arms that replace the factory rear trailing arms, allowing for precise modifications to camber, toe, and track settings. Whether you're a performance enthusiast, a track day driver, or someone looking to improve the handling and stability of your vehicle, this kit provides the tools needed to optimize your suspension geometry.

By upgrading to Whiteline's adjustable trailing arms, you'll experience enhanced steering response, improved cornering grip, and more predictable handling characteristics. The kit is engineered to help you fine-tune your vehicle's rear suspension for better alignment, increased stability during spirited driving, and improved tire wear. It's an ideal choice for those seeking to maximize their Subaru's performance on both the street and the track.

Key Features

Whiteline's KTA123 kit offers a range of advanced features designed to improve your vehicle's suspension performance:

• Complete set of four adjustable control arms with pre-fitted low-compliance polyurethane bushes for durability and consistent performance.
• Heavy-duty construction using high-strength materials to ensure long-lasting performance under demanding driving conditions.
• Designed specifically for Subaru Impreza WRX and STI models from 2011 to 2025, ensuring a perfect fit and seamless installation.
• Enables precise adjustment of rear camber, toe, and track settings, allowing you to tailor your suspension geometry for optimal handling.
• Reduces compliance and flex in the rear suspension, resulting in more direct and predictable vehicle response.
• Polyurethane bushes help maintain alignment settings and resist wear over time, providing consistent handling characteristics.
• Heavy-duty components help improve the connection between the vehicle's body and suspension, enhancing overall stability and control.
• Designed with performance driving in mind, suitable for both street and track use.
• Manufactured by Whiteline, a trusted name in suspension and chassis performance parts.

Construction & Design

The Whiteline KTA123 kit features robust construction with high-quality materials to withstand the rigors of spirited driving and track use. Each control arm is crafted from durable steel with a precision-machined design to ensure a perfect fit and reliable operation. The pre-fitted polyurethane bushes are selected for their low compliance, which minimizes unwanted movement and flex, translating to more accurate suspension geometry adjustments.

The adjustable arms incorporate high-precision threaded components, allowing for easy and accurate tuning of camber and toe angles. The design emphasizes strength and durability, with TIG welding and CAD-developed components that meet or exceed OEM standards. This ensures that your vehicle maintains optimal alignment and handling characteristics over time, even under aggressive driving conditions.

Performance & Handling

Upgrading to Whiteline's adjustable trailing arms significantly enhances your Subaru's rear suspension performance. The increased adjustment range allows you to dial in the ideal camber and toe settings for your specific driving style or track conditions. This results in improved cornering grip, better tire contact patch, and more predictable handling. The heavy-duty design reduces unwanted flex and compliance, providing a more direct connection between your vehicle's chassis and suspension components.

While this kit does not directly increase horsepower, it plays a crucial role in optimizing your vehicle's handling and stability, especially during high-performance driving. The improved suspension geometry helps you achieve better control, confidence, and tire longevity, making your Subaru more responsive and enjoyable to drive.

Installation & Fitment

The Whiteline KTA123 Trailing Arm Kit is designed as a bolt-on upgrade, with all components engineered for straightforward installation using standard hand tools. No cutting, drilling, or complex modifications are required. Proper alignment is recommended after installation to ensure optimal handling and tire wear. The kit is compatible with the factory rear suspension setup of Subaru Impreza WRX and STI models from 2011 to 2025, ensuring a seamless fit and function.

• Direct replacement for factory rear trailing arms
• Adjustable for camber, toe, and track alignment
• No cutting or drilling required
• Suitable for street, track, and performance applications

What's Included

• Four Whiteline Adjustable Control Arms with polyurethane bushes
• All necessary mounting hardware and fittings
• Installation instructions

Ideal For

• Performance enthusiasts seeking precise suspension tuning
• Track day drivers aiming for improved handling and stability
• Subaru owners looking to correct or enhance rear suspension alignment
• Anyone wanting a more predictable and responsive driving experience