BMW Drive Belts & V-Belts for BMW Z4 M Roadster S54 (2003-2008)

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Your BMW's drive belts are wear items, and will degrade and crack over time. Don't wait until you have a belt failure... don't get stranded! Replacing your BMW's belts, such as the alternator belt, power steering belt, air conditioning AC belt, or serpentine belt is a low cost insurance policy to preventing a break down -- or worse, engine damage. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are cause noise, it's time for new ones.

While also inspecting your serpentine belts, also check for wear or resistance in the pulleys. The tensioner pulley and deflection pulley are the primary sources for belt squealing. The rubber-isolated pulleys can also break apart, leading to total belt failure. We sell the tensioner and deflection pulleys for the M50 engine family used in the E34, E36, E39, E46, X5, Z3, and Z4.

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Turner Motorsport - Corporate Logo
T#:3465
Part#: PPK-MZ4
In Stock
Sale - Save 25% $ 354.99

This product was last offered at the strikethrough price on
06-13-2026

$ 266.24 USD
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Sale - Save 25%
$ 354.99

This product was last offered at the strikethrough price on
06-13-2026

$ 266.24 USD
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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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    ECS - Corporate Logo
    T#:20979672
    Part#: 6PK1460
    In Stock
    $ 33.99 USD
    Free Shipping on orders $49 and up
    Replaces BMW # 11287837898 ECS Tuning Performance Kevlar reinforced belts give you that extra piece of mind! Kevlar reinforced belts experience less elongation over time minimizing the amount of belt adjustment needed as well as offering a higher shock and impact resistance compared to OEM style belts. ECS Tuning Performance Kevlar reinforced belts have been put through a series of multiple tests such. Tensile strength Elongation Hardness Temperature and oil resistance per standard JASO E 109-94 Flex testing per SAE J2432.
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    ECS - Corporate Logo
    T#:23416515
    Part#: 5PK830
    Ships in 8 Business Days
    $ 26.99 USD
    Free Shipping on orders $49 and up
    Replaces BMW # 11287830946 ECS Tuning Performance Kevlar reinforced belts give you that extra piece of mind! Kevlar reinforced belts experience less elongation over time minimizing the amount of belt adjustment needed as well as offering a higher shock and impact resistance compared to OEM style belts. ECS Tuning Performance Kevlar reinforced belts have been put through a series of multiple tests such. Tensile strength Elongation Hardness Temperature and oil resistance per standard JASO E 109-94 Flex testing per SAE J2432.
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    Ina - Corporate Logo
    T#:2479
    Part#: 11281433571
    In Stock
    $ 62.17 USD
    Free Shipping
    $ 62.17 USD
    Free Shipping

    This is an OEM INA AC Belt Tensioner with pulley for all 2001-2006 E46 M3, as well as all 1999-2002 non-M E46 3 series models. These belt tensioner units are known to fail, and include the tensioner pulley (as shown).

    OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.

    As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

    This Air Conditioning / AC Belt Tensioner with Pulley fits:
    1999-2000 E46 3 Series 323i, 323Ci, 328i, 328Ci
    2001-2002 E46 3 Series 325i, 325Ci, 330i, 330Ci
    2001-2006 E46 M3 coupe & convertible

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    ECS - Corporate Logo
    T#:367060
    Part#: 002778ECS01
    Ships on Dec 8, 2026
    Sale - Save 10% $ 100.99

    This product was last offered at the strikethrough price on
    06-13-2026

    $ 90.89 USD
    Free Shipping
    Sale - Save 10%
    $ 100.99

    This product was last offered at the strikethrough price on
    06-13-2026

    $ 90.89 USD
    Free Shipping
    Most of the pulleys on your BMW engine are plastic, which become brittle and frail over time and from engine bay heat. A failed pulley could leave you stranded which is why it is vital to inspect the pulleys during routine maintenance. This is an aluminum version of the stock water pump pulley used on the S54 engine in the E46 M3, MZ3, and Z4M. It's the same size and uses the same hardware and the original belt as the stock plastic pulley. But the aluminum will last much longer.
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    Bremmen Parts - Corporate Logo
    T#:26305100
    Part#: 11281433571
    In Stock
    Sale - Save 21% $ 59.99

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

    $ 47.32 USD
    Free Shipping on orders $49 and up
    Sale - Save 21%
    $ 59.99

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

    $ 47.32 USD
    Free Shipping on orders $49 and up

    OEM INA Hydraulic Belt Tensioner - E36, E46, E39 6-cyl
    We Price Match - Give Us A Call or Chat!
    Ina - Corporate Logo
    T#:1603
    Part#: 11281717188
    Ships in 1-2 days
    $ 79.99 USD
    Free Shipping
    $ 79.99 USD
    Free Shipping

    For Alternator / Water Pump Belt

    Hydraulic Belt Tensioner for E36, E46, E39 6-cyl models. This is the oil-filled tensioner that keeps the main drive belt in the proper tension. Over time the piston seals inside allow fluid to leak out. The tensioner becomes frozen or inoperable. Replacement is the best corrective action to take. This can be done during any belt or pulley service or anytime the fan is off the engine.

    OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.

    As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!


    NOTE: These BMW's may have been equipped with either a mechanical or hydraulic tensioner. Only for cars with Hydraulic Belt Tensioners. Please check before ordering.

    This tensioner pulley fits the following BMWs:
    1991-1995 E34 525i (M50 engine)
    1992-1999 E36 325i, 325is, 328i, 328is, 323is
    1995-1999 E36 M3 (M3 3.0 & M3 3.2 liter)
    1997-2003 E39 525i, 528i, 530i
    1999-2000 E46 323i, 323Ci, 328i, 328Ci
    2001-2005 E46 325i, 325Ci, 325xi, 330i, 330Ci, 330xi
    2001-2006 E46 M3 coupe & convertible
    2000-2006 X5 3.0 liter (E53 chassis)
    2006 525i, 530i(M54 engine)
    1997-2002 Z3 & MZ3 2.8, M Roadster, M Coupe
    2003-2009 Z4 M Coupe and Roadster

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    Packaged by Turner - Corporate Logo
    T#:23482931
    Part#: S54KEVACCKT
    Ships in 8 Business Days
    Sale - Save 3% $ 333.99

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

    $ 323.77 USD
    Free Shipping on orders $49 and up
    Sale - Save 3%
    $ 333.99

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

    $ 323.77 USD
    Free Shipping on orders $49 and up
    Eliminate your squeaking accessory belt pulley and cracked drive belt with this upgraded accessory belt service kit! This kit includes the ECS Kevlar Reinforced Drive Belts, tensioner assemblies, and new tensioner pulleys. ECS Tuning's Red Kevlar Accessory Belts are both an aesthetic improvement and a performance alternative to a traditional belt. Kevlar-reinforced belts experience less elongation over time minimizing the amount of belt adjustment needed as well as offering a higher shock and impact resistance compared to OEM-style belts. Refreshing the rollers and/or tensioners simultaneously is a great way to ensure all vital components of your drive belt system are functioning optimally for years to come!
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    Ina - Corporate Logo
    T#:2045
    Part#: 11281748131
    In Stock
    $ 19.99 USD
    Free Shipping on orders $49 and up
    $ 19.99 USD
    Free Shipping on orders $49 and up

    This is an OEM INA tensioner pulley, also known as the adjusting pulley and lower pulley. This pulley is mounted on the belt tensioner near the center of the belt assembly. The upper and lower pulleys are known to be the primary sources for 'belt squealing'. This pulley is also encased in rubber which will crack over time. If left without service the rubber could fail completely, chucking the belt and leaving you stranded. Replacement is a very simple procedure and can be done anytime the fan is off the engine (belt replacement, water pump service, alternator replacement, etc).

    This pulley is mounted along with the hydraulic belt tensioner but can be replaced on its own. It is used for the main drive belt on the M50-M54 family engines (M50, M50TU, M52, S52, M52TU, M54, M56, and S54 engines). This is the same belt that covers the water pump/alternator/power steering systems. Replacement is a very easy procedure (requires fan removal) and will have your engine purring in no time. Belt replacement is strongly recommended at the same time. If you have a mechanical belt tensioner, the pulley can only be replaced with a new tensioner.

    OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.

    As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

    If you need the hydraulic belt tensioner, click here.

    This item is 70mm Diameter. Please check the diameter before ordering.

    This tensioner pulley fits the following BMWs:
    1991-1995 E34 525i (M50 engine)
    1992-1999 E36 325i, 325is, 328i, 328is, 323is
    1995-1999 E36 M3 (M3 3.0 & M3 3.2 liter)
    1997-2003 E39 525i, 528i, 530i - Only for Hydraulic Tensioner
    1999-2000 E46 323i, 323Ci, 328i, 328Ci - Only for Hydraulic Tensioner
    2001-2005 E46 325i, 325Ci, 325xi, 330i, 330Ci, 330xi - Only for Hydraulic Tensioner
    2001-2006 E46 M3 coupe & convertible - Only for Hydraulic Tensioner
    2000-2006 X5 3.0 liter (E53 chassis)
    2004 E60 525i, 530i (M54 engine)
    1997-2002 Z3 & MZ3 2.5, 2.8, 3.0, M Roadster, M Coupe
    2003-2009 Z4 M Coupe and Roadster

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    Ina - Corporate Logo
    T#:393585
    Part#: 12311713153
    In Stock
    $ 10.99 USD
    Free Shipping on orders $49 and up

    The OEM INA Tensioner Bearing allows the belt tensioner arm to rotate and apply pressure to the serpentine belt. With a bad bearing, the arm may seize up and prevent the tensioner from working properly.

    OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.

    As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform

    Show More Show Less
    Bremmen Parts - Corporate Logo
    T#:30629656
    Part#: 11287841228
    In Stock
    Sale - Save 22% $ 19.99

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

    $ 15.50 USD
    Free Shipping on orders $49 and up
    Sale - Save 22%
    $ 19.99

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

    $ 15.50 USD
    Free Shipping on orders $49 and up
    Bremmen Parts - Corporate Logo
    T#:30629659
    Part#: 11281748131
    In Stock
    Sale - Save 19% $ 18.99

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

    $ 15.29 USD
    Free Shipping on orders $49 and up
    Sale - Save 19%
    $ 18.99

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

    $ 15.29 USD
    Free Shipping on orders $49 and up

    This pulley is mounted along with the hydraulic belt tensioner but can be replaced on its own. It is used for the main drive belt on the M50-M54 family engines (M50, M50TU, M52, S52, M52TU, M54, M56, and S54 engines). This is the same belt that covers the water pump/alternator/power steering systems. Replacement is a very easy procedure (requires fan removal) and will have your engine purring in no time. Belt replacement is strongly recommended at the same time. If you have a mechanical belt tensioner, the pulley can only be replaced with a new tensioner.

    This high-quality replacement from Bremmen Parts is designed for exact fitment on your BMW. Whether you're looking to complete much-needed preventative maintenance, or replacing a failed roller, choose this component from Bremmen Parts for a lasting repair.

    If you need the hydraulic belt tensioner, click here.

    This item is 70mm Diameter. Please check the diameter before ordering.

    This tensioner pulley fits the following BMWs: 1991-1995 E34 525i (M50 engine) 1992-1999 E36 325i, 325is, 328i, 328is, 323is 1995-1999 E36 M3 (M3 3.0 & M3 3.2 liter) 1997-2003 E39 525i, 528i, 530i - Only for Hydraulic Tensioner 1999-2000 E46 323i, 323Ci, 328i, 328Ci - Only for Hydraulic Tensioner 2001-2005 E46 325i, 325Ci, 325xi, 330i, 330Ci, 330xi - Only for Hydraulic Tensioner 2001-2006 E46 M3 coupe & convertible - Only for Hydraulic Tensioner 2000-2006 X5 3.0 liter (E53 chassis) 2004 E60 525i, 530i (M54 engine) 1997-2002 Z3 & MZ3 2.5, 2.8, 3.0, M Roadster, M Coupe 2003-2009 Z4 M Coupe and Roadster

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    OEM INA Idler Pulley - Multiple BMWs
    We Price Match - Give Us A Call or Chat!
    Ina - Corporate Logo
    T#:1626
    Part#: 11287841228
    In Stock
    $ 18.99 USD
    Free Shipping on orders $49 and up
    $ 18.99 USD
    Free Shipping on orders $49 and up
    This is an OEM INA Upper Idler Pulley, also known as the roller pulley or deflection pulley. The upper and lower idler pulleys are known to be the primary sources for 'belt squealing'. The pulley is also encased in rubber which will crack over time. If left without service the rubber could fail completely, chucking the belt and leaving you stranded. Replacement is a very simple procedure and can be done anytime the fan is off the engine (belt replacement, water pump service, alternator replacement, etc).
    Show More Show Less
    Bremmen Parts - Corporate Logo
    T#:55030822
    Part#: 11287838797
    Ships on Sep 28, 2026
    New Item
    $ 59.99 USD
    $ 59.99 USD