Whiteline 25mm Rear Sway Bar – 2015-2017 Ford Mustang

Whiteline 25mm Rear Sway Bar – 2015-2017 Ford Mustang

Performance Rear Roll Stiffness for the S550 Mustang
The Whiteline BFR68Z is a 25mm 3-point adjustable rear sway bar for the 2015-2017 Ford Mustang (S550). The S550’s IRS rear suspension responds directly to rear sway bar stiffness calibration — the 25mm BFR68Z provides a performance-oriented step up from the factory rear bar for track days, autocross, and spirited street driving.

DETAILS

• 25mm 3-point blade adjustable rear sway bar
• Solid spring steel, silver powder coat
• Includes mount bushings and hardware
• 3 adjustment positions
• Fitment: 2015-2017 Ford Mustang (S550 chassis)

S550 IRS and Rear Bar
The S550 IRS allows precise rear roll stiffness calibration in a way the solid rear axle S197 couldn’t achieve. The 25mm BFR68Z provides performance-level rear roll stiffness — reducing body roll, improving rear tire contact under hard cornering, and allowing the IRS geometry to work more effectively.

Three Positions
Middle for a balanced track and street improvement. Outer for maximum rear stiffness on smooth circuits. Inner when slightly less than maximum is appropriate.

Pair With Front Bar
The S550 benefits from matched front and rear bar upgrades. Whiteline offers front bars for the S550, including the 35mm BFF95Z for maximum front stiffness.

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

Performance rear anti-roll hardware for the S550 Mustang IRS. 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

• 25mm 3-point blade adjustable rear sway bar
• Solid spring steel, silver powder coat
• Includes mount bushings and hardware
• 3 adjustment positions

Fitment