Not sure what kind of driving you are doing Jake, but most tech inspectors for racing will want steel lug nuts that show how many threads have engaged.
I would think aluminum would be stronger than magnesium.
I'm curious, are you also putting lugs up front or is it just for the 17mm spacers?
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Mike
04 Boxster S - Basalt/Savanna, 6sp, Carrera lites, hardtop
70 914-6 - Black over tan, original/stock
PCA since 1970
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