OBX Red Blue Silver Underdrive Crank Pulley Compatible with 2009 Hyundai Genesis Coupe 3.8L V6 Super Lightweight T-6061 T-6 Aircraft Grade Billet Aluminum Computer CNC Machined For Precision Balance Increased Horsepower And Torque Across Entire RPM Range Dyno-tested And Proven On Race Track High Quality Polished & Anodized Finishes