This is what I weighed them at when I did mine:
Stamped steel arm (with stock bushings and ball joint) 7.8 lbs
Aluminum arm (with poly bushings and ball joint) 6.4 lbs
A weight savings of 1.4 lbs per side.
If you have the steel arms with poly bushings, I wouldn't bother as I feel your money would be better spent elsewhere.
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