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

Clear BMW chassis

Please ensure your correct model is selected

Turner's power pulleys reduce the rotational speed and mass of accessory pulleys to increase power and response. The lightweight aluminum design looks great under the hood and won't rust like steel pulleys.
Sort By:

Turner Motorsport Power Pulley Upgrade Kit - Z4 M Roadster & Coup...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Turner Motorsport - Corporate Logo
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
Free Shipping
Sale - Save 25%
$ 347.99

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

$ 260.99 USD
Free Shipping
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
  • Show More Show Less
    Rogue Engineering Power Pulley Set - S54 - E46 M3, Z3/Z4 M
    affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
    Rogue Engineering - Corporate Logo
    T#:553971
    Part#: PP.S54
    Ships in 4 Business Days
    $ 259.00 USD
    Free Shipping
    $ 259.00 USD
    Free Shipping

    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

    Show More Show Less
    VAC Motorsports Lightweight Underdrive Power Pulley Set - S54 ...
    affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
    VAC Motorsports - Corporate Logo
    T#:27705420
    Part#: VACUPPSS542ULG
    Ships on Jun 23, 2026
    $ 294.99 USD
    Free Shipping on orders $49 and up

    Crafted from high-grade domestic USA 6061-T6 Billet Aluminum, these pulleys are a testament to precision engineering. Rigorously tested through extensive hours of racing and street use, they've proven their reliability and performance excellence.

    Each pulley is meticulously zero-balanced and thoroughly inspected to ensure zero-runout, guaranteeing optimal performance without compromising on reliability, noise, or vibration.

    This comprehensive kit comprises a precision power steering pulley, water pump pulley, and an OE Contitech Brand drive belt. Experience a notable boost of 8hp and 7 ft/lbs. of torque to the wheels, making it ideal for stock vehicles, track cars, and even those with upgraded audio systems seeking consistent voltage output from their alternators.

    Show More Show Less

    VAC Motorsports S54 Underdrive Power Pulley Set - 3 Pulley Race Set -...
    affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
    VAC Motorsports - Corporate Logo
    T#:29533361
    Part#: VACUPPSS543ULG
    Ships on Jun 23, 2026
    $ 349.99 USD
    Free Shipping on orders $49 and up
    These pulleys are precision made from domestic USA 6061-T6 Billet Aluminum. They have undergone thousands of hours in testing, race use, and street miles accumulated to show these pulleys work great and give you the edge. Each is precision zero-balanced and inspected for zero-runout for the best performance and to have no adverse effects on reliability, noise, or vibration. This 3 Pulley Race Set is a very popular choice: just like the 2 pulley set, a precision power steering pulley and water pump pulley are included, but VAC includes an additional underdriven alternator pulley for maximum power output on the track. We have seen 11hp and 9 ftlbs to the wheels on otherwise stock racing cars with this kit.
    Show More Show Less