ATI PERFORMANCE SUPER DAMPER Harmonic Damper [OUTER DIAMETER 6.78 (10% UD) | WEIGHT 6.75 LBS | SHELL MATERIAL ALUM | GROOVES 6 | 4 GROOVE REAR PULLEY | HUB MATERIAL STEEL] (1998-2002 Camaro & Firebird LS1 & 2004-2006 Pontiac GTO) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS