Whiteline Rear Sway Bar 27mm Adjustable Subaru STI 2004-2007 | BSR37XXZ

Improve your Subaru’s cornering balance and reduce body roll with the Whiteline BSR37XXZ 27 mm Adjustable Rear Sway Bar. This motorsports‑level sway bar is engineered to “activate more grip” by reducing chassis flex and distributing lateral loads more evenly across the tires.

With a 3‑point adjustable design, you can fine‑tune rear roll stiffness to match your driving style or track conditions. Whether you’re pushing hard on tight corners or cruising on the street, this bar gives you the flexibility to dial in optimal balance and control.

Key Features & Benefits

• 27 mm Bar Diameter — Robust stiffness appropriate for spirited driving and track use

• 3‑Point Adjustable — Choose among three stiffness settings to tailor roll behavior

• Motorsport Quality — Built to withstand high load conditions and repeated use

• Rear Position — Designed specifically for the rear of the vehicle

• Install Time — Approximately 1 hour

• Warranty — Covered by a 3‑year / 60,000 mile warranty

Technical & Fitment Details

Installation Tips & Best Practices

1. Safely lift and support your car, and remove the rear wheels to gain access.

2. Remove the factory rear sway bar and the existing bushings, brackets, and mounting hardware.

3. Clean the sway bar path, mounting surfaces, and bracket areas thoroughly of debris and old lubricant.

4. Install the BSR37XXZ bar in your desired stiffness setting (one of the three adjustment positions).

5. Use compatible bushings, brackets, and hardware (ideally performance grade) when mounting.

6. Torque all bolts to the manufacturer or Whiteline’s recommended specs.

7. After the first few miles of driving, recheck all fasteners to confirm none have loosened.

Pro Tip: Pick your initial stiffness setting conservatively (middle point), then test and adjust if needed. Using anti‑seize on hardware can help in future disassembly. Inspect periodically under track or high‑stress driving.