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Just like TorqueMan777 mentioned, thread title is misleading, as most posts were more about reducing rotational and rotational unsprung weight. It will net better acceleration/braking, but none of that is related to drivetrain power losses, which is mostly made up from friction in engine parts/gearbox/diff/multiple bearings/rotational resistance of tires. Most of those with exception of maybe tires are not easily changeable (and stock oem primacy tires to begin with are eco low rolling resistance tires, so most probably tires with higher grip and wider thread width will add to those losses).
But regarding to reducing rotational & rotational unsprung weight most including you were writing of:
1) go for TWS T66-F 16" wheels for even more weight savings (imho there are lighter forged wheels then these in 17" size), don't go for too wide wheels and too wide tires.
2) add aftermarket BBK kit to save weight also on brakes
3) your mentioned CF driveshaft
4) lightweight crank pulley. Little to no gains from other small ones.
And few other generic weight reduction items:
1) aftermarket exhaust (gaining also extra power/torque alongside)
2) soundtube delete
3) reduced volume window washer liquid tank
4) lightweight battery
5) lighter suspension components
6) lighter body CF components like roof/doors/bonnet/side mirrors and so on ..
Rest of items to reducing weight depending on how far you are willing to go/how much comfort you are willing to give up:
0) generic choice of car at lower trim with unheated cloth seats/without fog lights/few other extras of higher trims
1) racing seats (maybe just one, with delete of passenger seat)
2) rear seats delete
3) AC delete
4) audio delete
5) sound proofing delete
6) interrior panels delete
As last batch is usually done for track-only cars, then there probably will be some weight added back by installing rollcage, possibly some aero elements (like wing, splitter, side skirts), brake ducts, oil (and maybe diff) rad addition, possibly wider tires then stock.
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