Cusco Pillowball Rear Trailing Arm Bushing Kit

1992–1999 Subaru GC8 WRX / 2001–2007 GDB Subaru STI

Part #: 660 464 EV

Overview

The Cusco Pillowball Rear Trailing Arm Bushing Kit is a high-performance upgrade designed for Subaru enthusiasts who seek enhanced handling, precise steering, and improved cornering capabilities. Specifically engineered for the Subaru GC8 WRX and GDB STI models from 1992 to 1999 and 2001 to 2007 respectively, this kit replaces factory rubber bushings with high-precision pillow balls that significantly reduce suspension flex and alignment changes during aggressive driving.

Whether you're a spirited street driver, a track enthusiast, or an off-road adventurer, this bushing kit helps you achieve more accurate steering response and better straight-line stability. By reinforcing the suspension joints that are constantly loaded, it ensures your vehicle maintains optimal alignment and handling characteristics under demanding conditions. The result is a more confident driving experience with sharper turn-in and improved overall suspension performance.

Key Features

Cusco's Pillowball Rear Trailing Arm Bushing Kit incorporates advanced design and durable materials to deliver superior performance and longevity. Key features include:

• High-precision pillow balls crafted from durable, race-grade materials that eliminate compression and deflection, ensuring the suspension performs at its peak.
• Strengthened suspension joints that minimize alignment shifts during aggressive driving, enhancing cornering precision and straight-line stability.
• Rubber boots included to protect the pillow balls from dirt, debris, and moisture, extending service life and maintaining optimal performance.
• Engineered for a direct bolt-on installation, allowing for a straightforward upgrade without modifications.
• Designed to withstand the rigors of racing and spirited driving, providing a reliable upgrade for performance-minded Subaru owners.
• Reduces suspension flex, resulting in more predictable handling and improved steering feel.
• Constructed with high-quality materials that resist wear and corrosion, ensuring long-lasting performance.

Construction & Design

The Cusco Pillowball Rear Trailing Arm Bushing Kit features a robust construction utilizing high-precision pillow balls made from race-grade materials. These pillow balls are designed to provide a firm, direct connection between suspension components, eliminating the slight play inherent in rubber bushings. The bushings are housed in durable, high-strength metal sleeves that are TIG-welded for added strength and precision.

The inclusion of rubber boots helps shield the pillow balls from dirt, mud, and moisture, which can cause premature wear. The overall design emphasizes durability, precise fitment, and maximum performance, making it an ideal upgrade for those looking to push their Subaru's handling capabilities to the limit.

Performance & Sound

By replacing the factory rubber bushings with pillow balls, this kit provides a noticeable improvement in steering response and cornering accuracy. The rigid connection reduces suspension deflection, allowing your vehicle to respond more directly to driver inputs. While this upgrade enhances handling, it may also introduce a slightly firmer ride, which is typical for performance suspension components. The kit does not significantly alter exhaust sound or engine noise but contributes to a more engaged driving experience through improved suspension feedback.

Installation & Fitment

The Cusco Pillowball Rear Trailing Arm Bushing Kit is designed as a bolt-on upgrade, requiring no cutting, drilling, or extensive modifications. Installation involves removing the factory bushings and pressing in the pillowball units in their place. Basic mechanical skills and standard tools are sufficient for installation, which can typically be completed within a few hours. It is recommended to perform a wheel alignment after installation to ensure optimal handling and tire wear.

• Direct bolt-on replacement for factory bushings
• No cutting, drilling, or tuning required
• Suitable for street, track, and spirited driving applications

What's Included

• Complete pillowball rear trailing arm bushing kit with high-precision pillow balls
• Rubber boots for pillow ball protection
• Necessary hardware and installation instructions

Ideal For

This bushing kit is perfect for Subaru owners who want to improve their vehicle's handling, cornering, and steering response. It is especially beneficial for those who participate in track days, autocross, or spirited street driving, where suspension precision is critical. The upgrade is also suitable for enthusiasts seeking a more direct and engaging driving experience while maintaining reliability and durability.