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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For the E90/E92 enthusiast looking to bridge the gap between a high-end street car and a professional race machine, the BC Racing ZX Series offers an unparalleled level of feedback. By moving the compression valving to external canisters, the system effectively manages the heat generated during aggressive driving, maintaining valving accuracy and preventing "damper fade." The 3-way adjustment allows the driver to "dial in" the car for specific obstacles—for instance, softening high-speed compression to soak up aggressive track curbing while keeping low-speed compression firm for sharp turn-in response. Combined with standard front pillowball camber plates, this system eliminates factory rubber "mush," providing direct, unmediated steering feedback and allowing for aggressive alignment specs. Key Features: Triple-Valved Control: Precision adjustment of 30 clicks Rebound, 20 clicks Low-Speed Compression, and 12 clicks High-Speed Compression. Thermal Management: External canisters keep fluid away from hot brake components to ensure consistent lap times and drift consistency. Dual Piston Design: Combines the best characteristics of the DS and ER series for a broad range of damping authority. Motorsport-Grade Components: TIG-welded heavy-gauge steel shock bodies with black chrome finish and 6061-T6 aluminum components. Serviceable Construction: All components are individual and fully replaceable, ensuring the long-term serviceability of the system. Specifications: Vehicle Fitment: 2006–2011 BMW 3 Series E90 (Sedan) / E92 (Coupe) - Non-M Models. Spring Rates (Default): Front: 5.5 kg/mm | Rear: 9 kg/mm. Spring Type: High-strength SAE9254 cold-wound steel (Swift Spring upgrade available). Adjustability: Independent ride height, spring preload, and 3-way damping. Rebuildable: Fully rebuildable to original manufacturer specifications.
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