BO 101317 OBX Silver Underdrive Crank Pulley 94-01 Acura Integra ALL and 99-00 Civic Si ONLY 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, Consistent Horsepower Gain at all Speed levels High Quality Polished & Anodized Finishes