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Agency Power Underdrive Crank Pulley Kit V10 BMW M5 M6 E60 E63

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Agency Power Underdrive Crank Pulley Kit V10 BMW M5 M6 E60 E63

This pulley is made from 6061 aluminum that is precision CNC machined. All of our pulley kits are anodized and then laser engraved with the Agency Power name. This pulley kit includes new belts and bolts for a easy installation. This pulley has been reduced about 30% in diameter of the factory unit. Along with the reduction in rotational weight, the pulley gives improved throttle response on down low rpms where the V10 lags and pulls harder through the midrange. The pulley will not affect any harmonics that the OEM pulley may take into account. This is an extremely safe bolt on modification.

There is a gain across the full torque and horsepower RPM range during testing on a Mustang dyno with peak gains of about 13rwhp and 18ft/lbs of torque. The test vehicle was a 2006 SMG M5 running on 91octane in an ambient temperature of 95F. The car was equipped with a PowerChip ECU flash and Catback Exhaust by Agency Power. Compared to the competition, our pulley is the same overall underdriven diameter. Using the Mustang Dyno, performance numbers are always much lower than that of a DynoJet. We also only show true wheel horsepower gains. Peak torque and horsepower are made around 5900rpm.


  • BMW M5 E60 05-10
  • BMW M6 E63 06-10


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