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

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The next step in tuning your car's handling - after shocks/springs and camber plates - should be a set of swaybars. Using larger front and rear sway bars will give your car better/quicker turn-in and less bodyroll in corners. These bars replace the existing sway bars on the car for a clean and simple upgrade with very little downside. Sway bars should be matched with your springs/shocks to maintain a proper handling balance. In some cases only a front or rear bar is needed to positively change the balance and make the car more neutral. We sell sway bar kits from H&R, Racing Dynamics, OE BMW upgrades, and even some of our own designs. Swaybars are sold with new bushings. New links and other hardware are strongly recommended.

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Powerflex Black Series - Corporate Logo
T#:362738
Part#: PFR5-4609-21.5B2
Ships in 2 Business Days
$ 57.99 USD
Free Shipping on orders $49 and up

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. 

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Powerflex Black Series - Corporate Logo
T#:376516
Part#: PFR5-504-19BX2
Ships in 2 Business Days
$ 63.99 USD
Free Shipping on orders $49 and up
$ 63.99 USD
Free Shipping on orders $49 and up

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. 

This part fits the following BMWs:

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Bav Auto Front Sway Bar End Link - E46 Z4
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:600396
Part#: 31356780847
In Stock
Sale - Save 47% $ 18.99

This product was last offered at the strikethrough price on
05-03-2026

$ 10.00 USD
Free Shipping on orders $49 and up
Sale - Save 47%
$ 18.99

This product was last offered at the strikethrough price on
05-03-2026

$ 10.00 USD
Free Shipping on orders $49 and up
The sway bar on your vehicle is essentially a connection between the left and right lower control arms. When you take a corner in your vehicle, the sway bars flex and rebound like a spring. If the sway bar links are broken or worn, the system doesn't work as it should. Replace your end links and get all the performance characteristics back. New end links help you take turns better with less body roll. Some symptoms of failure are loose cornering, knocking noises, and a sloppy feeling when hitting bumps. They are very easy to replace and can be done by any automotive enthusiast.
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