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The 944 Spec racers that have had aluminum ball joint failures on their 85 1/2 cars almost all switch to the steel arms. Put them both on a scale, I think there is no weight advantage to the aluminum arms. While not a hard job, it is a slight PITA to replace the ball joints on the aluminum arms. With hard use, they do wear out.
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Jim Richmond
944 Spec race car, SoCal NASA & POC
01 Boxster S
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