Maybe this is old news, but I got this in an email from ATI.
ATI Super Dampers for Nissan KA24 Engines
ATI Performance Products is proud to introduce its renowned Super Damper for the 2.4L Nissan KA24 engine, (Part # 917756). Factory crankshaft dampers and underdrive pulleys offer no protection for high performance engines. However, the addidtion of the ATI Super Damper provides balanced dampening of torsional crankshaft vibrations throughout the entire RPM range. This 5-½” damper comes with all factory serpentine grooves and OEM located timing marks, so you can just bolt it on and go! All ATI Dampers exceed SFI 18.1 Safety Certification and are approved for competition use.