Rear Sway Bar for BMW Z4 M Roadster S54 (2003-2008)

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Interested in upgrading your BMW's rear sway bar? We carry a variety of rear sway bar options for your BMW. Check out our front sway bar section or front & rear if you're interested in a complete solution.

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Powerflex Polyurethane Rear Sway Bar Bushing Set - E46 M3
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Powerflex - Corporate Logo
T#:362728
Part#: PFR5-4609-21.5X2
In Stock
$ 57.99 USD
Free Shipping
$ 57.99 USD
Free Shipping

Sway bars transmit cornering forces from the outside wheels to the inside wheels, helping to keep the vehicle flat during cornering. This in turn reduces body roll and improves the driver's cornering confidence. OEM rubber sway bar bushings are designed with comfort in mind, allowing the sway bar to articulate while permitting additional movement, leading to less-than-ideal bar retention and causes unnecessary body roll.

Powerflex polyurethane sway bar bushings are firmer than factory rubber bushings, reducing body roll and keeping sway bars in check. Polyurethane bushings won't slop around like OEM bushings, allowing sway bars to function at their fullest potential.

Poweflex is a leading manufacturer of aftermarket suspension bushings. Using state of the art design and manufacturing, all replacement bushings are engineered to out-perform and out-last the ones that came in the car. Each line of bushings is meticulously tested and then re-tested to ensure perfect fitment and enduring quality through the life of the vehicle. A full lifetime warranty backs every one of their products and demonstrates the level of confidence and commitment Powerflex has to their customers. 

NOTE: For use with factory 21.5mm sway bar only

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Genuine BMW Rear Sway Bar Bushing - E46 M3 S54 3.2L Z4 M Roadster S54...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:15525
Part#: 31352229711
In Stock
Sale - Save 9% $ 65.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 59.99 USD
Limited Qty Sale
Free Shipping
Sale - Save 9%
$ 65.99

This product was last offered at the strikethrough price on
06-15-2026

$ 59.99 USD
Limited Qty Sale
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Genuine BMW Stabilizer Rubber Mounting - D=21,5Mm
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4

H&R Rear 25mm Adjustable Sway Bar - E46 M3, Z4 M Coupe/Roadster ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
H&R - Corporate Logo
T#:1879
Part#: 71414
Ships in 3 Business Days
10% off MSRP $ 459.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 413.10 USD
Free Shipping
10% off MSRP
$ 459.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 413.10 USD
Free Shipping

H&R adjustable 25mm rear sway bar / swaybar for all 2001-2006 E46 M3 coupe and convertible. Includes bushings. Made in Germany.

  • Reduces body roll
  • Highest tensile strength available

H&R Sport Sway Bars are designed for drivers who desire improved handling without lowering or affecting ride quality. H&R Sport Sway Bars increase your suspension's roll stiffness or its resistance to roll in turns while maintaining ride comfort and dramatically increasing cornering control, lateral stability, and grip. A unique feature of H&R Sport Sway Bars are the smooth, machined-like forged ends that, for specific vehicles, allow for adjustability in stiffness giving you an unmatched level of precision and performance.


This item fits the following BMWs:
2001-2006 E46 BMW M3
2006-2008 Z4 BMW M Coupe/Roadster

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ECS Billet Rear Sway Bar Brackets With Polyurethane Bushings - Pair -...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For use with Aftermarket 23mm rear sway bar
ECS - Corporate Logo
T#:3443018
Part#: 016921LA09
Ships on Jul 28, 2026
Sale - Save 10% $ 113.99

This product was last offered at the strikethrough price on
06-14-2026

$ 102.59 USD
Free Shipping
Sale - Save 10%
$ 113.99

This product was last offered at the strikethrough price on
06-14-2026

$ 102.59 USD
Free Shipping
The ECS Tuning Billet Rear Sway Bar Mounting Kit was designed, engineered, tested and quality inspected thanks by their Research and Development team in Wadsworth, Ohio facility. ECS ensures that the highest level of precision and quality is delivered throughout rigorous long term product testing and leading edge product development methods. This kit provides your vehicle with a more rigid mounting solution from the sway bar to chassis than the OEM steel brackets. With an improved sway bar mounting bracket and the included polyurethane sway bar bushings, you can expect to achieve an increase in rear sway bar effectiveness and less body roll as a result.
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