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The biggest weight savings if you want to keep a streetable car is probably the wheels, I bet you save over 50 lbs right there and it's unsprung rotational weight. If you get run-flats you can lose the spare and jack. The next place to look is the muffler--the stock muffler is heavy. And the AC, of course. Replace power windows with manual cranks (they work better anyway). If you can apply Rain-X every month you can live without wipers & motors. I bet this stuff saves you over 200 lbs. I'm sure you could also make a lighter-weight engine cover, hood, and trunk lid--and possibly save another 100 lbs.
For racing--definitely lose the spare tire and jack, spare tire bracket, windshield washer, and replace the fuel tank with a fuel cell just big enough for your needs. Glass is heavy, so replace the window glass with Lexan, you can probably fasten it permanently up (you don't want drag, do you?) with less weight even than a manual window. Back window and Targa too. Although, for the targa--just duct tape in some corrugated cardboard. Oh, remove the headlights and headlight motors, radio, speakers and wire. Lose the passenger seat, use a racing seat for yourself. Strip the interior down to the bare metal. Lightweight steering wheel. Yeah, lighter pulleys and flywheel. Now, what else to toss, to save weight? Gearshift boot, parking brake & cables, rear-view mirrors (who needs to know what's back there?) and of course all the carpet & insulation. Get the cross-drilled brake rotors, those are lighter. You could lose the body kit and spoiler--but not sure that will help once you factor aerodynamics. That's about all I can think of, I'm sure there is some other stuff too.
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