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ATI Serpentine SFI 18.1 Super Damper - 7.425 in OD - AC Pulley - Black Oxide - Internal Balance - GM LS-Series 23011813 This means that it isThe patented ATI Super Damper is the only crankshaft damper designed exclusively for high performance Chevy engines. ATI Performance Products is a company founded on innovation, precision and service. ATI harmonic Super Dampers add horsepower and torque to race, street and truck engines. ATI Performance Products is the creation of over 40 years of Transmission and performance component manufacturing and racing experience. Product Description: Harmonic