ATI PERFORMANCE SUPER DAMPER Harmonic Damper [OUTER DIAMETER 8.12 (15% OD) | WEIGHT (WITHOUT HUB) 11.85 LBS | SHELL MATERIAL ALUM | RIBS 10 | HUB MATERIAL STEEL] (2007-2014 Mustang Shelby GT500 & Cobra Jet) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS