ATI PERFORMANCE SUPER DAMPER Harmonic Damper [OUTER DIAMETER 6.78 (10% UD) | WEIGHT 4.5 LBS | SHELL MATERIAL ALUM | RIBS 8 | HUB MATERIAL STEEL] (GM LS7 & LS3) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS