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LesBaer makes some great points.
I would adjust your plan a little.
Throw out the ideas of light weight body parts. CF stuff thats currently on the market is 1-2 pound savings in place of its aluminum counterpart. Real light weight stuff CF is going to cost your 2-3X those prices and will be brittle and probably not fit as well as stock.
If you want to go lighter, Get yourself a race seat and harness bar for track days and look at a lighter wheel option. Remove the seats and install your race seat for track days and bolt on your light weight wheels with better compound. That will easily hit your 100 pound reduction goal right there without sacrificing the DD ability of the car. If you want to drop an extra 20 the battery is not a bad idea but your cost per pound saved starts to become a stretch.
When it comes to power, Ported stock intake/TB, Rotofab and some headers with a good e85 track tune and your looking at 50-75 horsepower increase over stock while still keeping the good street manners.
I dont agree with changing the suspension of the 1LE, the car has been dialed in by GM already and they forgot more than any of us think we know. Poly and rod end stuff is in constant need of attention and loud and clanky on the street (been there done that).
Add some of the 2SS goodies you want, they wont affect weight.
The rest of the money that you saved would be more wisely spent on driving school and track days. Good luck!
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