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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...

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T#:31059479

Part#: 11287838194KT

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$ 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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OEM INA Accesory Belt Tensioner Pulley - Air Conditioner - BMW E9X M3...

For clockwise power steering pump

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T#:31092500

Part#: 11287838196KT

Ships in 1-2 days

$ 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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Meyle Crankshaft Position Sensor - E31, E38, E39, E52, E60, E63, E64,...

5X Entries Into Our F80 M3 Sweepstakes
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T#:579358

Part#: 3148990000

Ships on Oct 29, 2026

$ 37.99 USD

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$ 37.99 USD

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Referred to as the speed sensor & reference sensor

OEM INA Idler Pulley - Multiple BMWs

For vehicles with a production date up to 04/2008

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T#:1626

Part#: 11287841228

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$ 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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Meyle Idler Pulley

For vehicles with a production date up to 04/2008

5X Entries Into Our F80 M3 Sweepstakes
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T#:369422

Part#: 11287841228

In Stock

Sale - Save 60% $ 32.63

This product was last offered at the strikethrough price on
05-02-2026

$ 13.00 USD

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Sale - Save 60%

$ 32.63

This product was last offered at the strikethrough price on
05-02-2026

$ 13.00 USD

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Runs on water pump and alternator belt, used on both mechanical and hydraulic tensioner systems

Active Autowerke - S65 Power Pulley DPK Belt Kit - E9X M3

For vehicles with production date from 6/2008

For vehicles with production date from 6/2008

T#:50934275

Part#: 13-001D

Ships in 3 Business Days

$ 75.00 USD

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$ 75.00 USD

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Free Up Real S65 Power — Engineered the Turner Way Your S65 is already making the power. This kit simply lets you keep more of it. The Active Autowerke Power Pulley Kit for the BMW E9X M3 reduces parasitic drag at the crankshaft, trimming rotational mass and freeing up horsepower that would otherwise be consumed by accessory drive load. The result is a measurable increase in rear-wheel output without sacrificing the balance, cooling capacity, or long-term durability expected from a properly engineered BMW upgrade. The crank pulley is CNC-machined from billet 6061 aluminum and finished with a hard-coat anodize for durability under sustained high-RPM operation. Unlike undersized pulleys that compromise system function, this design maintains proper operating characteristics while delivering real-world gains. Late-2007 production E9X M3 models transitioned to a double-sided (DPK) A/C belt configuration. Rather than forcing a workaround, Active Autowerke developed a proper DPK-compatible solution — including the correct matched belt. Applicable kits also include a spare DPK belt for added insurance. Dyno testing on a Mustang chassis dyno confirms gains of 10–12+ rear-wheel horsepower on an otherwise stock vehicle. Installation is fully reversible and requires no permanent modification. Product Highlights 10–12+ RWHP gain verified on stock S65 engines Complete bolt-on system CNC-machined 6061 billet aluminum crank pulley Hard-coat anodized finish for durability Includes correct replacement drive and A/C belts Spare DPK belt included where applicable Compatible with manual and DCT-equipped E9X M3 Reduces parasitic drag and rotational mass Designed to maintain proper operating temperatures Works in conjunction with Active Autowerke performance software Available for single-sided and double-sided (DPK) belt configurations Fitment Information Confirm whether your E9X M3 is equipped with a single-sided or double-sided (DPK) A/C belt prior to ordering to ensure correct application. A properly engineered solution for enthusiasts who want measurable gains while preserving OEM-level refinement and reliability.

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Meyle V-ribbed AC Belt - E9x - M3 - S65

5X Entries Into Our F80 M3 Sweepstakes

T#:55497380

Part#: 500061065

Ships on Oct 29, 2026

$ 6.99 USD

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$ 6.99 USD

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Meyle components are renowned for meeting or exceeding original equipment standards. This V-ribbed belt utilizes advanced synthetic rubber compounds designed to withstand high RPMs, extreme engine bay temperatures, and rigorous driving conditions.

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Meyle - Auxiliary Belt - E46, E90, E92, E93, Z3, Z4

5X Entries Into Our F80 M3 Sweepstakes

T#:40546016

Part#: 11287830945

Ships on Oct 29, 2026

$ 15.99 USD

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$ 15.99 USD

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A high-quality, OE-style replacement serpentine belt designed to deliver reliable power to critical engine components, ensuring optimal performance and durability.

Meyle Outdoor Temperature Sensor / Probe

5X Entries Into Our F80 M3 Sweepstakes
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T#:579266

Part#: 3009190001

Back Ordered

$ 44.99 USD

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$ 44.99 USD

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Common fix for incorrect OBC temperature readings

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