ATI PERFORMANCE SUPER DAMPER Harmonic Damper [OUTER DIAMETER 7.48 | WEIGHT 7.9 LBS | SHELL MATERIAL ALUM | GROOVES 6 & 4 | REAR PULLEY | HUB MATERIAL STEEL] (2012-2015 Camaro ZL1 & 2009-2015 Cadillac CTS-V) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS