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None of them saves too much. The hood is already aluminum and about the trunk it is good to have some more weight on the rear cause of better weight distribution. It doesn't really worth it, unless your car has already stripped interior, a rear wing for down force and you want to save the last possible grams. The only thing that might worth it is to go for carbon fiber doors, but I suppose you won't have the same protection in side collisions. Such changes should be really done on a dedicated racing car that will go with a trailer from-to the track.
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