ATI PERFORMANCE SUPER DAMPER Harmonic Damper [STEEL SHELL | 6.325 OD | 3 RING | TOTAL WEIGHT 8.3 LBS | INERTIA WEIGHT 2.4 LBS] (GM LS1) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS