WRX-STI Rear Sway Bar Bushings 20mm

The WRX-STI Rear Sway Bar Bushings 20mm from PROTHANE are engineered for Subaru WRX and STI owners who demand improved chassis dynamics and cornering precision. These polyurethane bushings replace the factory rubber components that degrade under aggressive driving, track use, and spirited road driving. Built for vehicles that see regular performance driving, these non-greasable rear sway bar bushings eliminate the compliance issues inherent in stock rubber, delivering tighter suspension geometry and more responsive handling feedback through every turn.

Constructed from premium polyurethane with a 20mm diameter specification, these bushings resist deflection and bushing slip that compromise your suspension tuning and alignment settings. Unlike worn rubber bushings that allow lateral movement and energy loss, polyurethane maintains consistent stiffness across temperature ranges and driving conditions, preserving your sway bar's anti-roll effectiveness and keeping your WRX-STI planted during high-speed cornering. The non-greasable design eliminates maintenance overhead while providing superior durability—a critical advantage for owners running aggressive suspension geometry or modified spring rates where bushing material degradation accelerates wear.

These rear bushings suit any WRX or STI platform upgrade—whether you're addressing worn OEM components, upgrading a modified suspension, or building a comprehensive chassis stiffness package alongside front sway bar bushings and engine mounts. Installation pairs with a socket set and basic hand tools; the pair format covers both rear bar mounting points. For best results, perform the replacement during full suspension service or when upgrading to coilovers, ensuring all suspension pivot points benefit from renewed compliance control and eliminating the inconsistent handling that mixed-age bushings create.