Whiteline 20mm Heavy Duty Fixed Rear Sway Bar – 2015-2021 Subaru WRX / 2008-2021 STI

Whiteline 20mm Heavy Duty Fixed Rear Sway Bar – 2015-2021 Subaru WRX / 2008-2021 STI

Solid Rear Anti-Roll Upgrade Without Adjustment Complexity
The Whiteline BSR49 20mm heavy-duty fixed rear sway bar for the 2015-2021 WRX and 2008-2021 STI is a direct bolt-on upgrade that improves rear anti-roll stiffness over the factory bar. Non-adjustable design simplifies installation and eliminates the need to manage adjustment positions over the life of the bar. For drivers who want a clean, simple sway bar upgrade at a fixed stiffness, this is the correct choice.

DETAILS

• 20mm heavy-duty fixed rear sway bar for 2015-2021 Subaru WRX and 2008-2021 STI
• Non-adjustable — simplified installation and long-term maintenance
• Hollow chromoly steel construction
• Includes mount bushings and hardware for installation
• Improves rear anti-roll stiffness over OEM

Fixed vs. Adjustable — The Choice
An adjustable bar is correct if you plan to tune the car’s handling balance or if you’re tracking the car and want to be able to adjust the setup between sessions. A fixed bar is correct if you know the stiffness you want, don’t want to manage adjustment positions, and want the simplest possible installation. The BSR49 at 20mm is a solid entry-level choice for drivers in the latter category.

Heavy-Duty Construction
Despite the non-adjustable design, the BSR49 is built to Whiteline’s heavy-duty standards. The hollow chromoly construction handles the torsional loads of regular performance driving without fatigue.

VA WRX and GR/VA STI Coverage
Covers both the 2015-2021 VA WRX and the 2008-2021 STI (GR through VA). The rear sway bar mount geometry is consistent across these platforms at the 20mm diameter.

Why Choose Whiteline

Whiteline has been engineering suspension components from their facility in Australia since 1979. Every product in their catalog is developed with a clear goal: measurable improvement in handling, stability, and tyre contact. Whiteline’s polyurethane bushings, sway bars, control arms, and alignment correction kits are engineered using finite element analysis and validated on track before they reach the market. Their components are direct-fit, bolt-on solutions designed for enthusiasts who want real performance gains without fabrication or custom work.

The RallySport Take

Simple, effective, correctly-built. If you want improved rear anti-roll on your WRX or STI without the complexity of an adjustable setup, the BSR49 delivers. Installation is a straightforward bar swap — remove the OEM bar, install the Whiteline unit with the provided polyurethane mount bushings, connect the endlinks. Start in the middle adjustment position and move from there. Adjustable endlinks are a worthwhile companion purchase if the car has been lowered, ensuring the bar operates at zero preload at the new ride height.

What’s in the Box

• 20mm heavy-duty fixed rear sway bar for 2015-2021 Subaru WRX and 2008-2021 STI
• Hollow chromoly steel construction
• Improves rear anti-roll stiffness over OEM

Fitment