Agency Power has been manufacturing power pulley kits since 2004 for a variety of different vehicles. Agency Power's latest pulley kit has been engineered, designed, and tested with impressive results less the BMW tax. Their pulley is made from 6061 aluminum that is precision CNC machined. All of their pulley kits are anodized and then laser engraved with the Agency Power name. Their pulley kit includes new belts and bolts for an 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.