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Last time I was working in the auto industry, mag and aluminum parts were the same cost for us to manufacture. Mag was a bit more than alum, but mag is lighter and overall a wash. Mag wheels are probably forged which costs more. Our parts were cast. Mag is considerably lighter than alum. I'm not saying make the whole car out of it, just castings. Years ago mag was uber expensive, that is no longer the case. I've picked up mag indy car racing wheels and its like picking up a bicycle wheel, it's amazing. It's not like you can catch mag on fire with a match. Yes in a car fire, it's hard to put out.
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