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It doesn't really matter. The only thing you need to ask questions like these about are things with moving parts, or what deals with the airflow. If it just sits there most all are the same. But don't get a ghetto brand off of anything.
I bought Steeda's and they were just re-packaged asp.racing pulleys for my '94. I don't think the brand matters....not a lot of technology there. Good info on the asp site....they list the amount of reduction in a percentage for each pulley.
I use March and have never had any issues with their performance since day one. No charging or cooling problems either. However, I do use a 180 degree thermostat as recommended by Steeda.
I bought ford motor sport, I just happened to be in the ford dealership for something and got a case of the wants and they were in stock. Also they are a sweet blue color
Steeda and ASP are the only ones that Steeda timing adjusters will fit.If this is not in the question then get either one,but don't get the piggyback type.You must have a harmonic balancer.