Are AMS pulleys “underdriven” or stock diameter?
AMS has a strict philosophy in creating power only through increased efficiency and not sacrificing comfort or reliability in order to achieve more power. Thus, AMS only makes stock diameter pulleys in order to maintain OEM standards for reliability and comfort. In addition, it ensures 100% compatibility with ALL potential future modifications. By maintaining the stock diameter our pulley allows performance enthusiasts to ALSO run aftermarket accessory pulley systems as well as aftermarket supercharger systems and etc. 100% compatibility is one of the many benefits of our design.