AEM Tru Power pulleys are made from CNC machined 6061 T-6 billet aluminum to increase horsepower and engine response without the need to remove the torsional vibration damper or emission control devices. AEM Tru Power Pulleys are lighter in weight and larger in diameter slowing down the power steering and alternator, reducing the amouny of energy needed to drive them. Significant horsepower gains can be realized with this simple to install package with no recorded effect on emission levels. Each application includes both power steering and alternator pulleys and high performance custom-fitted belts. Available in anodized red, blue, or silver.