Power Steering Pulleys for BMW Z4 M Roadster S54 (2003-2008)

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If your power steering pulley is bad, Turner Motorsport stocks quality replacement BMW parts to get your vehicle back on the road.

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Turner Motorsport Power Pulley Upgrade Kit - Z4 M Roadster & Coup...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:3465

Part#: PPK-MZ4

Ships in 5 Business Days

Sale - Save 25% $ 347.99

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

$ 260.99 USD

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Qty

Sale - Save 25%

$ 347.99

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

$ 260.99 USD

Add to Wish List

Underdrive Power Pulleys work to 'free up' horsepower. Any accessory that spins from the main drive belt is using up power. That's power that could otherwise be used to move the car. By giving some of that power back to the engine, you can make the car faster! It's like FREE HORSEPOWER !

Underdrive pulleys for your BMW will slow down engine-mounted accessories - the water pump, power steering pump, and alternator*. These systems contribute to 'parasitic losses' - power lost from what the engine could produce if it did not have these systems. Since less energy is used to move them, that power is transferred back to the engine and used to propel the car. Our pulleys give a 10-20% reduction in rotation, releasing up to 11hp on most BMW six-cylinder engines. There's also a small but noticeable improvement in throttle response too! We have done extensive testing and development work, both on and off the track, to ensure that the accessory systems function as they should. On our Racing pulley kits we actually underdrive certain components more so we feel our Street pulleys are an ideal compromise between power/torque gains, reliability, and system performance. Our pulley kits have been on the market for over ten years, and used in all of our own cars, with zero component failures related to their use.

Our pulleys are made from T-6061 aluminum and finished in a durable black hard anodize that is very resistant to wear, chemical exposure, and heat. We designed our pulleys to look similar to the factory parts but also to be stronger and, in most cases, slightly lighter too. For example, With our hardcoat aluminum you will never have to worry about a serious failure of a stock plastic pulley. A 'stealth' approach to aesthetics was our goal and we let the results speak for the pulley design. Installation is straight forward and easy with simple hand tools. Removal of the fan is required for access to the front of the engine. Total install time for a 3-piece pulley set should be around 1.5 hours. A new longer belt is included and we also recommend replacing the separate A/C belt, belt tensioners, and the guide and deflection pulleys at the same time.

Additional Info

Clickhere for example dyno graph

Click here for installation instructions.

Turner Pulley Kit contents:

Turner water pump pulley

Turner power steering pump pulley

new extended length belt

instructions

This underdrive pulley kit fits the following BMW:
2006-2008 MZ4 Z4 M Coupe / Z4 M Roadster

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BMW Power Steering Pully - 32427830838

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:45757458

Part#: 32427830838

Ships in 2 Business Days

$ 50.99 USD

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$ 50.99 USD

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A new power steering pulley is key to keeping your steering system smooth and reliable. Over time, pulleys can warp, crack, or wear, causing belt slippage, whining noises, or even pump failure. Installing a fresh pulley restores correct belt alignment, eliminates noise, and maintains consistent hydraulic pressure for precise, effortless steering. Why choose a new pulley? Smooth operation – Ensures proper belt tension for dependable pump performance. Noise reduction – Eliminates squealing, whining, or vibration from worn pulleys. System protection – Protects the pump and steering components from damage. Install a new pulley and keep your steering system running quietly, efficiently, and confidently.

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Rogue Engineering Power Pulley Set - S54 - E46 M3, Z3/Z4 M

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:553971

Part#: PP.S54

Ships in 4 Business Days

$ 259.00 USD

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$ 259.00 USD

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Rogue Engineering has developed a power pulley kit that reduces the drag on specific pulleys while allowing others to remain at their same efficiency. This allows for perfect operation in daily driven vehicles without a hiccup or stutter. However, when the demand for power is requested, the power pulley kit allows for the freed power to become apparent. The term "power" pulley is a bit of a misnomer. Underdrive pulleys actually free up power by reducing the drag caused by the accessories. These pulleys are based off a calculated percentage from factory dimensions, so that particular component speeds are safely reduced without affecting their true purpose.

Rogue Engineering Power Pullies are CNC machined from 6061-T6, heat treated aluminum and specially coated with a MIL-A-8625 Type III hard coat anodize finish. This kind of anodizing is not to be confused with a Type II cosmetic anodize finish (typical colors such as red, blue, silver, green, etc.). The hard coat anodize finish actually builds a small surface layer on top of the aluminum, preventing wear.

This part fits the following BMW engines:
S54

This part fits the following chassis:
E46, Z3, Z4

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