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.
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.
Prop 65 Warning
Product Q&A
Lifetime Replacement
This product is not eligible for Lifetime Replacement
Fits These Cars
MAKE
MODEL
SUBMODEL
ENGINE
Special Fitment Notes
BMW
E90
M3
S65 4.0L
Use vehicle selector to confirm fitment
BMW
E92
M3
S65 4.0L
Use vehicle selector to confirm fitment
BMW
E93
M3
S65 4.0L
Use vehicle selector to confirm fitment
*The above product applications have been written by Turner Motorsport. All
warranties, product application, fitment, and performance are the responsibility of Turner Motorsport.
For additional information see the terms of use.
Prop 65 Warning
