BMW Engine Parts for BMW E90 M3 S65 4.0L

E9X M3 Performance Underdrive Pulley Kit

For vehicles with a production date from 05/2008+ & a counterclockwise rotating Power S...

T#:593749

Part#: 10.00.011

Ships in 5 Business Days

$ 349.00 USD

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$ 349.00 USD

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Free additional power to your M3’s rear wheels without sacrificing or compromising your BMW’s reliability. Machined from 6061-T6 aerospace aluminum, Macht Schnell Performance Underdrive Pulleys are strong as well as lightweight to limit parasitic drag from the accessories within a moderate level for maximum performance on or off the track. After machining and engraving, pulleys are then T3 hard anodized for additional strength, anti-corrosion & wear resistance. Our DualDrive design replaces the Crank Accessory & Power Steering Pulleys, resulting in an additional 9-14 HP and 7-9ft. lbs TQ gain for the M3. Gains are due to a reduction in power required to turn accessories; an increase in accessories lifespan due to lower speed will also result. All factory harmonics/balancing are undisturbed. Macht Schnell Performance Underdrive Pulleys have no negative effect on accessory operation and comes fully equipped with new belts. Already have this kit and need new belts? See T#14491 and T#14489 Performance Underdrive Pulleys Features: DualDrive design allows maximum performance, with minor effect on accessory speed Proper cooling temperatures are retained at proper levels on or off the track Maintains proper alternator speed, allowing sustained levels to sensitive control modules Machined from 6061-T6 aerospace aluminum T3 Hard-Anodized for maximum strength and corrosion/wear resistance No affects to crankshaft dampening or harmonics Simple bolt-on installation

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E9X M3 6/2008+ Dinan Underdrive Pulley Kit

For vehicles with a production date from 06/2008

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T#:389532

Part#: D560-0004

Ships in 5 Business Days

Sale - Save 10% $ 449.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 404.96 USD

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$ 449.99

This product was last offered at the strikethrough price on
09-28-2026

$ 404.96 USD

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Active Autowerke Power Pulley Kit - E9x M3

For vehicles with production date 2007-5/2008

T#:397285

Part#: 13-001

Ships in 3 Business Days

5% off MSRP $ 399.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 379.99 USD

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5% off MSRP

$ 399.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 379.99 USD

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Easy to install - reduces parasitic losses from belt driven auxiliary components. Engine crankshaft pulley remains the same, this modification simply unleashes untapped potential from your vehicle. Expect to see gains around 10 RWHP from your S65. All BMW power pulleys included, including alternator, water pump, and power steering pulleys.

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BMW E9X M3 Replacement Belt For Underdrive Pulley Kit - (D560-0004) ...

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T#:586064

Part#: D561-0002

Ships in 5 Business Days

Sale - Save 10% $ 126.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 114.26 USD

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Sale - Save 10%

$ 126.99

This product was last offered at the strikethrough price on
09-29-2026

$ 114.26 USD

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BMW E9X M3 Replacement Belt For Underdrive Pulley Kit - (D560-0004) is an essential component designed specifically for the Underdrive Pulley Kit. This belt is one of the two required for optimal performance of the kit.

Designed for Precision: Tailored to fit the BMW E9X M3 Underdrive Pulley Kit perfectly.
High-Quality Construction: Built to withstand the demands of high-performance driving.
Optimal Performance: Ensures smooth operation and reliable power delivery.
Easy Replacement: Simple to install, making maintenance straightforward.

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Replacement Belt For Underdrive Pulley Kit D560-0003 & D560-0004 ...

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T#:586065

Part#: D561-0007

Ships in 5 Business Days

Sale - Save 10% $ 95.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 86.30 USD

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Sale - Save 10%

$ 95.99

This product was last offered at the strikethrough price on
09-29-2026

$ 86.30 USD

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Active Autowerke Supercharger Kit - E9X M3 2008-2013

T#:340094

Part#: AASC-E9XM3

Back Ordered

Starting at $ 9,995.00 USD

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Starting at $ 9,995.00 USD

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The advanced design and sleek features of the Active Autowerke Supercharger System include a front mount air-to-air intercooler system with a separate oil cooler for the supercharger unit's independent oil system. The Active Autowerke Supercharger Plenum replaces the factory air box and is designed to have an OEM-type look with custom finishes available at the customer's request. The Active Autowerke Supercharger Plenum has been designed with eight high-flow velocity stacks, and large three-inch intercooler piping to supply cooled air.

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Active Autowerke Rotrex Traction Fluid - 1 Liter

T#:57616348

Part#: RTF-1L

Ships in 3 Business Days

7% off MSRP $ 140.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 130.00 USD

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7% off MSRP

$ 140.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 130.00 USD

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Rotrex superchargers utilize a unique traction drive system that sets it apart from other centrifugal-style superchargers. For best performance, Rotrex recommends replacing this fluid every 50,000 miles. This bottle of traction fluid is plenty enough for one supercharger service (typically 750ml).

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Replacement Belt For Underdrive Pulley Kit D560-0003

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T#:586063

Part#: D561-0003

Ships in 5 Business Days

Sale - Save 10% $ 63.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 57.56 USD

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Sale - Save 10%

$ 63.99

This product was last offered at the strikethrough price on
09-29-2026

$ 57.56 USD

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

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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Active Autowerke - S65 Gen2 Supercharger Kit (Level 3/ 700HP)- E9X M3...

T#:397305

Part#: 12-030

Ships in 10 Business Days

5% off MSRP $ 18,749.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 17,811.99 USD

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5% off MSRP

$ 18,749.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 17,811.99 USD

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Since getting their start in 1981, Active Autowerke has earned a well-respected reputation in the BMW community for engineering high-quality power solutions for popular BMW models. This supercharger kit will produce 700 horsepower and 480 ft.lbs. of torque on your BMW, while retaining platform integrity and daily driveability. Unique to the design of the Rotrex supercharger is the traction drive system, which eliminates the lag often found in other centrifugal supercharger setups. Power delivery is smooth and dependable, and 100% reversible to stock if you so choose, since each system is designed as a self-contained unit.

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Active Autowerke Supercharger Kit Gen 2 Level 4 - E9X M3 S65 4.0L ...

T#:57616347

Part#: 12-032-C38

Ships in 10 Business Days

$ 23,749.00 USD

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$ 23,749.00 USD

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The Active Autowerke Supercharger System is powered by a Rotrex C38-92R Supercharger Unit mounted with a custom CNCed bracket that uses a dedicated drive belt system, while eight high flow fuel injectors are used to supply the additional required fuel. Active Autowerke's Performance Software, available for 91-93 octane, race gas, and octane levels unique to other countries, is carefully calibrated, and is at the heart of the system to provide an unparalleled driving experience. Keeping within the factory's OBDII parameters, the Active Autowerke Supercharger System ensures consistency for everyday driving. The Level 4 system includes a water/methanol injection system with upgraded pulley and custom software.

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BFI Transmission Mounts - Stage 1 - BMW E30 / E36 / E46 / E9X / Z3 / ...

T#:50934269

Part#: BFI-BMW-TRANS-01

Ships on Oct 30, 2026

$ 69.99 USD

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$ 69.99 USD

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This kit is a "must-have" for any E36, E46, or E9X owner looking to tighten up their drivetrain's foundation and ensure long-term mechanical reliability.

Active Autowerke - S65 Gen2 Supercharger Kit (Level 2/ 640HP)- E9X M3...

T#:397304

Part#: 12-029

Ships in 10 Business Days

5% off MSRP $ 16,249.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 15,436.99 USD

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5% off MSRP

$ 16,249.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 15,436.99 USD

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Since getting their start in 1981, Active Autowerke has earned a well-respected reputation in the BMW community for engineering high-quality power solutions for popular BMW models. This supercharger kit will produce 640 horsepower and 413 ft.lbs. of torque on your BMW, while retaining platform integrity and daily driveability. Unique to the design of the Rotrex supercharger is the traction drive system, which eliminates the lag often found in other centrifugal supercharger setups. Power delivery is smooth and dependable, and 100% reversible to stock if you so choose, since each system is designed as a self-contained unit.

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BMW Engine Parts for BMW E90 M3 S65 4.0L

Sub-Categories

E9X M3 Performance Underdrive Pulley Kit

E9X M3 6/2008+ Dinan Underdrive Pulley Kit

Active Autowerke Power Pulley Kit - E9x M3

BMW E9X M3 Replacement Belt For Underdrive Pulley Kit - (D560-0004) ...

Replacement Belt For Underdrive Pulley Kit D560-0003 & D560-0004 ...

Active Autowerke Supercharger Kit - E9X M3 2008-2013

Active Autowerke Rotrex Traction Fluid - 1 Liter

Replacement Belt For Underdrive Pulley Kit D560-0003

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

Active Autowerke - S65 Gen2 Supercharger Kit (Level 3/ 700HP)- E9X M3...

Active Autowerke Supercharger Kit Gen 2 Level 4 - E9X M3 S65 4.0L ...

BFI Transmission Mounts - Stage 1 - BMW E30 / E36 / E46 / E9X / Z3 / ...

Active Autowerke - S65 Gen2 Supercharger Kit (Level 2/ 640HP)- E9X M3...

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