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As for shedding weight, doesn't it already use an aluminum hood? It's got an aluminum engine. I don't see anyway to get much of any weight out of it.
As for aggressive gearing, the fuel economy is already suspect. Decreasing it further , to say 13 mpg in the city isn't going to work. The only other engine they can stick in it is the LS7,and that isn't going to happen. Aside from suspension tweaks, the car pretty much is what it is , till the next generation.
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