Whiteline Rear Sway Bar 20mm Adjustable – 2005-2009 Subaru Legacy

Sharpen the Rear Balance on the BL/BP Legacy
The Whiteline BSR39Z is a 20mm 3-point adjustable rear sway bar for the 2005-2009 Subaru Legacy (BL/BP chassis). The Legacy’s factory rear bar calibration is tuned for comfort and stability — appropriate for its mission as a family performance sedan but conservative for enthusiast driving. A rear bar upgrade shifts the handling balance and reduces body roll, making the car more responsive and enjoyable to drive at speed.

DETAILS

• 20mm 3-point blade adjustable rear sway bar
• Solid spring steel, silver powder coat
• Includes polyurethane mount bushings and hardware
• 3 adjustment positions
• Fits 2005-2009 Subaru Legacy (BL/BP chassis)
• Direct bolt-on installation

BL/BP Legacy — Underappreciated Performance Chassis
The 2005-2009 Legacy GT is a turbocharged Subaru sedan with genuine performance credentials — the EJ20T/EJ25T engine, AWD, and a solid chassis that responds well to suspension upgrades. The factory rear sway bar is undersized for performance driving. Whiteline’s BSR39Z corrects this imbalance and brings the rear roll stiffness in line with the car’s actual performance potential.

Three Positions for Tuning Flexibility
The three adjustment positions let you match the rear bar stiffness to the front bar and spring rates. Start with a middle position for a balanced improvement. If the car still understeers, stiffen the rear. If the rear feels too active, ease back one position.

Works Well With Front Bar Upgrade
Whiteline produces a front sway bar for the BL/BP Legacy GT (BSF35Z/BSF41Z). Running matched Whiteline bars front and rear provides the most balanced handling improvement — both ends of the car responding consistently to the same roll stiffness calibration.

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

A well-priced rear bar upgrade for a platform that doesn’t get enough aftermarket attention. The BL/BP Legacy GT is a capable car that rewards proper suspension development. 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 3-point blade adjustable rear sway bar
• Solid spring steel, silver powder coat
• Includes polyurethane mount bushings and hardware
• 3 adjustment positions

Fitment