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Oh I almost forgot
RB (RacingBrake) rear replacement 350x26mm brake rotors. I'm running these on my car now for the past 2,500 miles or so.
RB states 9lb lighter than new stock rotors, my scales back that up roughly (I don't have anything that can do better than a few tenths of a pound repeatably until I get down to the capacity of my kitchen scale)
$1150, including a set of RB's rear street pads (price has gone up slightly since my purchase)
So, worst case you lose 7lb:
$164/lb
Best case you lose 9:
$128/lb
And if you want to really best-case it, you'd probably be buying rear pads for $100-ish, so:
$117/lb
And it's rotating, unsprung mass. Not a bad deal
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