The CTS Turbo crank pulley is lightened to reduce parasitic drag on the engine. This results in faster revving and more horsepower. Included in the kit is the lightened crank pulley, replacement OEM bolt and a shorter belt. The pulley is made from T6 6061 aircraft grade aluminum and hard anodized to reduce wear. Gains of 5-7 horsepower can be expected. Note that Audi switched to electric power steering in facelifted models, please make the selection on the drop-down menu. NOTE: VW TOOL T10355 IS REQUIRED FOR INSTALLATION