Achieve optimal performance with the ATI D-Series Damper. This top of the line damper exceeds the SFI 18.1 safety certification, making it an ideal option for NHRA & IHRA competition. The damper is designed with a 4-rib 5.5" serpentine belt drive and features 360° laser-etched timing marks, for improved engine accuracy. Invest in the best with the ATI D-Series Damper.