ATI Performance Products, Inc. is proud to introduce its renowned Super Damper for Chevy Duramax Diesel Engines. Unlike unbalanced underdrive pulleys, which offer no protection to high-performance engines, the ATI Super Damper provides balanced dampening of torsional crankshaft vibrations at all RPM. The ATI Super Damper comes with laser-etched timing marks and is a direct replacement for the stock OEM unit. The Super Damper is especially needed in high performance and modified trucks to help protect against harmful engine harmonics and features a six groove serpentine belt drive on the outer shell to utilize the factory serpentine belt set-up. All ATI Super Dampers exceed SFI 18.1 Safety Certification and are approved for competition use.