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Dial In Rear Grip Without Touching Ride Height
Body roll under hard cornering steals grip from your outside tires right when you need it most. This Whiteline BBR45Z rear anti roll bar bolts in as a direct upgrade over the factory rear sway bar on your M3, adding a 26mm two point adjustable bar that lets you tune rear stiffness to match your driving style, from daily street duty to track days. Two mounting positions mean you can soften the bar for comfort or firm it up for maximum lateral response without changing springs or shocks.
Key Features
- 26mm solid bar diameter, significantly stiffer than factory rear sway bar
- Two point adjustability lets you tune roll stiffness for street or track
- Reduces body roll for flatter cornering and more consistent tire contact
- Includes new mounting bushings for a complete, correct installation
- Direct bolt-in design uses factory mounting locations, no cutting or drilling
- MPN BBR45Z is engineered specifically for the E9x M3 chassis and rear geometry
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2008-2013 | BMW | M3 |
Specifications
| Detail | Value |
|---|---|
| Manufacturer | Whiteline |
| MPN | BBR45Z |
| UPC | BBR45Z |
| Position | Rear |
| Bar Diameter | 26mm |
| Adjustability | 2 Point Adjustable |
| Includes | Anti Roll Bar and Mounting Bushings |
What's Included
- 1 x Whiteline 26mm rear anti roll bar assembly
- 2 x mounting bushings
About Whiteline
Whiteline designs and manufactures suspension components engineered to sharpen handling while preserving daily drivability. Their sway bars, control arms, and bushing kits use proprietary synthetic elastomers and precision engineered geometry to correct factory suspension compliance and unlock more consistent, predictable handling.
FAQ
What is the BBR45Z?The BBR45Z is a Whiteline 26mm two point adjustable rear anti roll bar built for the 2008-2013 BMW M3, designed to reduce body roll and sharpen rear end response over the factory sway bar.
Does this rear anti roll bar fit all M3 body styles?Yes, this rear anti roll bar fits the M3 sedan, coupe, and convertible body styles built on the E9x chassis for the 2008-2013 model years.
What does two point adjustable mean on this sway bar?Two point adjustable means the end link mounting holes offer two positions, allowing you to select a softer or stiffer roll stiffness setting depending on whether you prioritize comfort or maximum handling response.
Will this bar work with my factory sway bar end links?The kit includes new mounting bushings, but factory end links are typically compatible since the bar uses the stock mounting locations. Inspect your end links for wear and replace if needed during installation.
Does installing this sway bar require an alignment afterward?A sway bar swap does not change ride height or suspension geometry, so a full alignment is not required, though it is good practice to inspect alignment settings after any suspension work.
Can I install this sway bar myself or does it require a shop?Most experienced DIY installers can complete this swap with basic hand tools and a jack and stands, though a shop install ensures correct torque specs and bushing orientation.
Will this bar affect my ride quality on the street?Set to the softer of the two adjustment positions, this bar maintains a comfortable street ride while still reducing body roll compared to the factory bar.
Does this sway bar work with lowering springs or coilovers?Yes, this rear anti roll bar is commonly paired with lowering springs or coilovers as part of a complete handling upgrade, since it addresses roll stiffness independently of ride height.
Install Instructions
- Raise and safely support the rear of the vehicle on jack stands
- Remove the factory rear sway bar end links and mounting bracket bolts
- Remove the factory rear sway bar and mounting bushings from the vehicle
- Install the new Whiteline mounting bushings onto the sway bar
- Position the bar and torque the mounting brackets to factory specification
- Reconnect the end links at your preferred adjustment hole and torque to spec
- Lower the vehicle and inspect all fasteners before test driving
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