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You guys are confusing un-sprung weight with un-sprung mass. Most of the time the terms are interchangeable, but even if you somehow achieved negative weight, the mass is what matters.
Anyway, on topic... best places to lose weight on a car:
Wheels
Tires
Brakes
Exhaust
Intake
Battery
Spare Tire/jack/tools
not carry around extra crap
Those are all legal mods in *ST classes, and it's not uncommon for a *ST autocross car to weigh in 150-200lbs below curb weight, without sacrificing any creature comforts.
That said, I wouldn't pursue replacing any parts with lightweight parts until they wear out. For the battery, you can use a Deka battery (much cheaper than the Odyssey, and same manufacturer as Braille) for a significant weight savings when your current battery dies. When your tires go bad, look into some used lightweight wheels at the same time and you can probably save a few pounds per corner. If you are willing to do some non-reversible mods you can save some more weight with strategic cutting.
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