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Lots of stuff in there... Here is what stands out to me.
-The AFM delete isn't necessary if you are buying a 1LE, manual transmission does not have AFM.
-For lightweight battery, Odyssey is pretty good. Look into Braille also, they have super lightweight Lithium Ion batteries as well (ML20c is $1600, but 6.1lbs) (I like to convert weight savings into $/pound. $42/pound saved).
-Saving 1.3oz per wheel on lug nuts is a bit, well, academic. It is $169/pound saved.
-Exhaust is definitely a cost effective weight savings
-Wheels could be an opportunity, I don't know that anyone has weighed the current 1LE setup. They claim to be forged, but GM's wheels are usually on the heavy side. Forgelines might allow some weight savings, but this would be quite expensive.
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