Nick M;1887451 said:
How? Wheels and rotors? There isn't really anything else.
Wheels and rotors, yes. Calipers are another fairly big area you can lighten things up. Tires to a *small* extent, but that is going to be a case-by-case basis.
Suspension components are also unsprung weight, correct? I may be mistaken there, but I thought they were. Either way, yet another area you can lose a bit of weight. Getting an aluminum or carbon driveshaft, aluminum radiator, swapping in an LS...
If you're feeling like spending some money, you can always start replacing parts with lighter items. Carbon fiber hoods are a fairly easy to obtain way to drop 30lbs. Replacing the front and rear crash bars with aluminum (I plan on snagging the ones from my LS400 for the Supra), there are all SORTS of things you can do. To keep it a nice car still though... be prepared to spend a bit of money.
For day-to-day weight reduction, just follow the autocross rule: If it isn't bolted to the vehicle, take it out.