SPL Rear Traction Arms Subaru WRX / STI 2015-2021 | SPL RTR GK

Product Fitment:

2015-2021 Subaru WRX

2015-2021 Subaru STI

Experience a significant improvement in rear wheel control with the SPL Parts Rear Traction Arms, engineered for 2015‑2021 Subaru WRX and STI models (VA platform). These arms are crafted to address common suspension weaknesses—particularly during hard launches, heavy cornering, or high‑power applications—by eliminating bushing flex and offering full adjustability of rear geometry.

Fabricated from billet 6061‑T6 aluminum and engineered using FEA (finite element analysis), these arms feature a slotted design with double‑adjuster chromoly hardware and blue‑anodized titanium fasteners to dial in the perfect setup while reducing unsprung weight. The inclusion of Teflon‑lined FK Heim rod ends ensures quiet articulation, low friction, and high durability across street and track use.

Key Features:

• High‑precision billet 6061‑T6 aluminum arms for superior stiffness

• Electroless nickel‑plated 4130 Chromoly double‑adjuster enables fine‑tuning of anti‑squat and bump‑steer characteristics

• Blue‑anodized titanium socket‑head cap screws reduce weight and resist corrosion

• Teflon‑lined FK three‑piece rod ends for smooth motion and minimal deflection under load

• Sold as a pair and built for high‑performance or race‑oriented use

• Proudly made in the USA

Why Upgrade These Arms?
If your WRX or STI suffers from rear‑end instability, wheel hop on launches, or flex in the suspension under load, these traction arms transform the behavior of the rear axle. By upgrading from soft factory rubber mounts to fully adjustable, solid‑link traction arms, you gain improved power transfer, consistent tire contact, and sharper handling response.

Installation & Fitment Notes:

• Works with stock rear suspension subframe and components; some setups may require minor alignment adjustments

• After installation, alignment (especially rear camber/toe) is highly recommended for optimal performance and tire wear