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Steeda and March make pullies that have internal dampers. DO NOT buy piggybacks. I personally have Steedas.
There is no performance difference in pullies, they all do the same thing the same way....
+1 I've seen and installed the Steeda's on my buddies and they seem top notch. I'll be doing a Steeda HB with Mezier (sp) electric water pump. Should net some decent #'s.