BMW Engine Parts for BMW E90 M3 S65 4.0L

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Turner Motorsport has everything you need to upgrade your BMW through our stages of performance or to keep your car in peak condition with our range of the latest in proven OEM cooling parts. Upgrade your cooling system and engine performance with the selections below to give your BMW a performance and reliability advantage.

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OEM INA Accessory Belt Tensioner Pulley - Water Pump/Alternator - BMW E9X M3 S65
OEM INA Accessory Belt Tensioner Pulley - Water Pump/Alternator - BMW...
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Ina - Corporate Logo
T#:31059479
Part#: 11287838194KT
In Stock
$ 30.99 USD
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$ 30.99 USD
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If your water pump or alternator belt tensioner has failed because of the pulley or bearing, this replacement pulley is all you need to get your BMW back on the road! BMW and other brands usually sell the tensioner with the metal arm included, which increases the cost, even though the arm often doesn't need replacement. This OEM replacement is a much more affordable option, saving you $150 or more compared to the Genuine BMW tensioner.
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Hella Hella Horn - Low Tone
Hella Hella Horn - Low Tone
Hella - Corporate Logo
T#:590880
Part#: 2768082
In Stock
$ 36.99 USD
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$ 36.99 USD
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Disc Type Low-Tone, 12 V, 335 Hz with Bracket
OEM INA Accesory Belt Tensioner Pulley - Air Conditioner - BMW E9X M3 S65
OEM INA Accesory Belt Tensioner Pulley - Air Conditioner - BMW E9X M3...
For clockwise power steering pump
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Ina - Corporate Logo
T#:31092500
Part#: 11287838196KT
Ships in 1 day
$ 25.99 USD
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$ 25.99 USD
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If your air conditioning belt tensioner has failed because of the pulley or bearing, this replacement pulley is all you need to get your BMW back on the road! BMW and other brands usually sell the tensioner with the metal arm included, which increases the cost, even though the arm often doesn't need replacement. This OEM replacement is a much more affordable option, saving you $180 or more compared to the Genuine BMW tensioner.
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Hella Hella Horn - High Tone
Hella Hella Horn - High Tone
Hella - Corporate Logo
T#:592707
Part#: 2768551
In Stock
$ 30.99 USD
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$ 30.99 USD
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Disc Type High-Tone, 12 V, 400 Hz with Bracket
Hella Air Horn Kit
Hella Air Horn Kit
Hella - Corporate Logo
T#:592708
Part#: 3001651
Ships in 1 Business Day
$ 143.99

This product was last offered at the strikethrough price on
05-07-2026

$ 124.99 USD
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$ 124.99 USD
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Get noticed with this air horn kit from Hella!
Hella Relay
Hella Relay
Hella - Corporate Logo
T#:592718
Part#: 965400001
In Stock
$ 14.99 USD
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$ 14.99 USD
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12V 30A SPST relay with bracket
Hella Horn - Low-Tone
Hella Horn - Low-Tone
Hella - Corporate Logo
T#:28869559
Part#: 7424001
Ships in 5 Business Days
$ 17.99 USD
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$ 17.99 USD
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Universal fit. Not direct fit.
OEM INA Idler Pulley - Multiple BMWs
OEM INA Idler Pulley - Multiple BMWs
For vehicles with a production date up to 04/2008
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Ina - Corporate Logo
T#:1626
Part#: 11287841228
In Stock
$ 18.99 USD
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$ 18.99 USD
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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).
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Hella Horn - High-Tone
Hella Horn - High-Tone
Hella - Corporate Logo
T#:592716
Part#: 7424011
In Stock
$ 17.99 USD
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$ 17.99 USD
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Upgrade the sound of your BMW or MINI with the Hella Horn - High-Tone. This high-quality horn delivers a powerful and attention-grabbing sound, enhancing safety on the road. Designed for easy installation, it provides a quick and effective way to improve the audible presence of your vehicle.

  • Powerful and attention-grabbing sound
  • Enhances safety on the road
  • Easy installation for convenience
  • Compatible with BMW and MINI models
  • High-quality construction for durability

Enhance the audible presence of your BMW or MINI with the Hella Horn - High-Tone, ensuring you're heard when it matters most.

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BMW | Screw
BMW | Screw
Vaico - Corporate Logo
T#:57231520
Part#: 07119901299
In Stock
New Item
$ 2.99 USD
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$ 2.99 USD
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M8x16
Battery Tender Plus Advanced Battery Charging System
Battery Tender Plus Advanced Battery Charging System
Battery Tender - Corporate Logo
T#:49892371
Part#: BTT0210128
In Stock at Vendor
$ 69.99 USD
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$ 69.99 USD
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New 150A Alternator
New 150A Alternator
SEG Automotive - Corporate Logo
T#:58965212
Part#: 0124.525.561
Ships on Nov 2, 2026
New Item
$ 487.99 USD
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$ 487.99 USD
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SEG Automotive, the company behind Bosch's starter motor and generator business, builds this brand-new 150-amp alternator with a freewheel pulley that smooths out belt loads for a quieter, longer-lasting accessory drive.
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