Whiteline Rear Sway Bar 22mm Adjustable – 2004-2007 Subaru STI

Whiteline Rear Sway Bar 22mm Adjustable – 2004-2007 Subaru STI

Street Rear Bar for the GD STI
The Whiteline BSR37Z is the 22mm 3-point adjustable rear sway bar for the 2004-2007 Subaru STI — the street and mixed-use rear bar option for the GD STI platform. Three adjustment positions provide flexibility for street, occasional track use, and everything between.

DETAILS

• 22mm 3-point blade adjustable rear sway bar
• Solid spring steel, silver powder coat
• Includes mount bushings and hardware
• 3 adjustment positions
• Fitment: 2004-2007 Subaru STI (GD chassis)
• Street and mixed-use application

The Right Spec for Most GD STI Builds
The BSR37Z is the most broadly applicable rear bar for the GD STI. The 22mm diameter provides meaningful improvement over the factory rear bar with three adjustment positions. For most GD STI owners — street-driven with occasional track days — the 22mm is the correct choice. More aggressive builds can step up to the 24mm BSR37XZ or 27mm BSR37XXZ.

Three Positions
Middle for a balanced street and track tune. Outer for more aggressive rear roll stiffness on track days. Inner for a slightly softer setting if full 22mm is more than needed.

Pair With the BSF36Z Front Bar
The BSR37Z rear bar pairs naturally with the BSF36Z (22mm) front bar for a matched street and track anti-roll setup on the GD STI.

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

The standard rear bar for the GD STI. 22mm, three positions, direct fitment. 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

• 22mm 3-point blade adjustable rear sway bar
• Solid spring steel, silver powder coat
• Includes mount bushings and hardware
• 3 adjustment positions
• Street and mixed-use application

Fitment