Active Autowerke Underdrive Pulley Kit - E6x M5 / M6 (13-002)

Active Autowerke Underdrive Pulley Kit - E6x M5 / M6 (13-002)The Active Autowerke Underdrive Pulley Kit for E6x M5 and M6 is designed to optimize power delivery by reducing parasitic drag on the BMW S65 V10 engine's accessory components that share the drive belt system. This kit modifies pulley drive ratios to reduce engine load from accessories such as air conditioning and power steering, thereby unlocking additional horsepower. Crafted from aircraft grade 6061 billet aluminum with a hard black anodized finish

The Active Autowerke Underdrive Pulley Kit for E6x M5 and M6 is designed to optimize power delivery by reducing parasitic drag on the BMW S65 V10 engine's accessory components that share the drive belt system. This kit modifies pulley drive ratios to reduce engine load from accessories such as air conditioning and power steering, thereby unlocking additional horsepower.

• Crafted from aircraft-grade 6061 billet aluminum with a hard black anodized finish for durability and quiet operation
• Precisely engineered pulley diameter, groove pitch, and belt alignment with optimized pulley offset
• Includes replacement drive and A/C belts for a complete bolt-on installation
• Retains the factory crank hex drive adapter and does not alter factory harmonic dampening
• Reduces rotational mass without causing the overheating issues associated with smaller pulley designs
• Installation is straightforward and fully reversible, maintaining near-factory appearance
• Compatible with other Active Autowerke performance products such as performance software and exhaust systems
• Demonstrated power gains of approximately 10 to 12+ rear wheel horsepower on in-house dynamometer testing

This pulley kit is an effective performance upgrade for BMW M enthusiasts seeking to enhance engine efficiency by optimizing accessory drive load without compromising reliability or factory component function.